diff --git a/components/vc-tree-select/generate.tsx b/components/vc-tree-select/generate.tsx
index fe6bba0d2..a6a8fcec9 100644
--- a/components/vc-tree-select/generate.tsx
+++ b/components/vc-tree-select/generate.tsx
@@ -29,14 +29,17 @@ import { SelectContext } from './Context';
 import useTreeData from './hooks/useTreeData';
 import useKeyValueMap from './hooks/useKeyValueMap';
 import useKeyValueMapping from './hooks/useKeyValueMapping';
-import type { CheckedStrategy } from './utils/strategyUtil';
 import { formatStrategyKeys, SHOW_ALL, SHOW_PARENT, SHOW_CHILD } from './utils/strategyUtil';
 import { fillAdditionalInfo } from './utils/legacyUtil';
 import useSelectValues from './hooks/useSelectValues';
 import { treeSelectProps, TreeSelectProps } from './props';
 import { getLabeledValue } from '../vc-select/utils/valueUtil';
 import omit from '../_util/omit';
-import { defineComponent } from 'vue';
+import { computed, defineComponent, ref, toRef, watch, watchEffect } from 'vue';
+import { convertDataToEntities } from '../vc-tree/utils/treeUtil';
+import { conductCheck } from '../vc-tree/utils/conductUtil';
+import { warning } from '../vc-util/warning';
+import { INTERNAL_PROPS_MARK } from '../vc-select/interface/generator';
 
 const OMIT_PROPS: (keyof TreeSelectProps)[] = [
   'expandedKeys' as any,
@@ -91,9 +94,413 @@ export default function generate(config: {
     props: treeSelectProps(),
     slots: [],
     name: 'TreeSelect',
-    setup(props) {
-      return () => {
+    TreeNode: TreeNode,
+    SHOW_ALL: SHOW_ALL,
+    SHOW_PARENT: SHOW_PARENT,
+    SHOW_CHILD: SHOW_CHILD,
+    setup(props, { expose, slots, attrs }) {
+      const mergedCheckable = computed(() => props.treeCheckable || props.treeCheckStrictly);
+      const mergedMultiple = computed(() => props.multiple || mergedCheckable.value);
+      const treeConduction = computed(() => props.treeCheckable && !props.treeCheckStrictly);
+      const mergedLabelInValue = computed(() => props.treeCheckStrictly || props.labelInValue);
+
+      // ======================= Tree Data =======================
+      // FieldNames
+      const mergedFieldNames = computed(() => fillFieldNames(props.fieldNames, true));
+
+      // Legacy both support `label` or `title` if not set.
+      // We have to fallback to function to handle this
+      const getTreeNodeTitle = (node: DataNode) => {
+        if (!props.treeData) {
+          return node.title;
+        }
+
+        if (mergedFieldNames.value?.label) {
+          return node[mergedFieldNames.value.label];
+        }
+
+        return node.label || node.title;
+      };
+
+      const getTreeNodeLabelProp = (entity: FlattenDataNode) => {
+        const { labelRender, treeNodeLabelProp } = props;
+        const { node } = entity.data;
+
+        if (labelRender) {
+          return labelRender(entity);
+        }
+
+        if (treeNodeLabelProp) {
+          return node[treeNodeLabelProp];
+        }
+
+        return getTreeNodeTitle(node);
+      };
+
+      const mergedTreeData = useTreeData(toRef(props, 'treeData'), toRef(props, 'children'), {
+        getLabelProp: getTreeNodeTitle,
+        simpleMode: toRef(props, 'treeDataSimpleMode'),
+        fieldNames: mergedFieldNames,
+      });
+
+      const flattedOptions = computed(() => flattenOptions(mergedTreeData.value));
+      const [cacheKeyMap, cacheValueMap] = useKeyValueMap(flattedOptions);
+      const [getEntityByKey, getEntityByValue] = useKeyValueMapping(cacheKeyMap, cacheValueMap);
+
+      // Only generate keyEntities for check conduction when is `treeCheckable`
+      const conductKeyEntities = computed(() => {
+        if (treeConduction.value) {
+          return convertDataToEntities(mergedTreeData.value).keyEntities;
+        }
         return null;
+      });
+
+      // ========================== Ref ==========================
+      const selectRef = ref(null);
+
+      expose({
+        scrollTo: selectRef.value.scrollTo,
+        focus: selectRef.value.focus,
+        blur: selectRef.value.blur,
+
+        /** @private Internal usage. It's save to remove if `rc-cascader` not use it any longer */
+        getEntityByValue,
+      });
+
+      const valueRef = ref<DefaultValueType>(props.defaultValue);
+
+      watch(
+        () => props.value,
+        () => {
+          if (props.value !== undefined) {
+            valueRef.value = props.value;
+          }
+        },
+        { immediate: true },
+      );
+
+      /** Get `missingRawValues` which not exist in the tree yet */
+      const splitRawValues = (newRawValues: RawValueType[]) => {
+        const missingRawValues = [];
+        const existRawValues = [];
+
+        // Keep missing value in the cache
+        newRawValues.forEach(val => {
+          if (getEntityByValue(val)) {
+            existRawValues.push(val);
+          } else {
+            missingRawValues.push(val);
+          }
+        });
+
+        return { missingRawValues, existRawValues };
+      };
+
+      const rawValues = ref<RawValueType[]>([]);
+      const rawHalfCheckedKeys = ref<RawValueType[]>([]);
+
+      watchEffect(() => {
+        const valueHalfCheckedKeys: RawValueType[] = [];
+        const newRawValues: RawValueType[] = [];
+
+        toArray(valueRef.value).forEach(item => {
+          if (item && typeof item === 'object' && 'value' in item) {
+            if (item.halfChecked && props.treeCheckStrictly) {
+              const entity = getEntityByValue(item.value);
+              valueHalfCheckedKeys.push(entity ? entity.key : item.value);
+            } else {
+              newRawValues.push(item.value);
+            }
+          } else {
+            newRawValues.push(item as RawValueType);
+          }
+        });
+
+        // We need do conduction of values
+        if (treeConduction.value) {
+          const { missingRawValues, existRawValues } = splitRawValues(newRawValues);
+          const keyList = existRawValues.map(val => getEntityByValue(val).key);
+
+          const { checkedKeys, halfCheckedKeys } = conductCheck(
+            keyList,
+            true,
+            conductKeyEntities.value,
+          );
+          rawValues.value = [
+            ...missingRawValues,
+            ...checkedKeys.map(key => getEntityByKey(key).data.value),
+          ];
+          rawHalfCheckedKeys.value = halfCheckedKeys;
+        }
+        [rawValues.value, rawHalfCheckedKeys.value] = [newRawValues, valueHalfCheckedKeys];
+      });
+
+      const selectValues = useSelectValues(rawValues, {
+        treeConduction,
+        value: valueRef,
+        showCheckedStrategy: toRef(props, 'showCheckedStrategy'),
+        conductKeyEntities,
+        getEntityByValue,
+        getEntityByKey,
+        getLabelProp: getTreeNodeLabelProp,
+      });
+
+      const triggerChange = (
+        newRawValues: RawValueType[],
+        extra: { triggerValue: RawValueType; selected: boolean },
+        source: SelectSource,
+      ) => {
+        const { onChange, showCheckedStrategy, treeCheckStrictly } = props;
+        const preValue = valueRef.value;
+        valueRef.value = mergedMultiple.value ? newRawValues : newRawValues[0];
+        if (onChange) {
+          let eventValues: RawValueType[] = newRawValues;
+          if (treeConduction.value && showCheckedStrategy !== 'SHOW_ALL') {
+            const keyList = newRawValues.map(val => {
+              const entity = getEntityByValue(val);
+              return entity ? entity.key : val;
+            });
+            const formattedKeyList = formatStrategyKeys(
+              keyList,
+              showCheckedStrategy,
+              conductKeyEntities.value,
+            );
+
+            eventValues = formattedKeyList.map(key => {
+              const entity = getEntityByKey(key);
+              return entity ? entity.data.value : key;
+            });
+          }
+
+          const { triggerValue, selected } = extra || {
+            triggerValue: undefined,
+            selected: undefined,
+          };
+
+          let returnValues = mergedLabelInValue.value
+            ? getRawValueLabeled(eventValues, preValue, getEntityByValue, getTreeNodeLabelProp)
+            : eventValues;
+
+          // We need fill half check back
+          if (treeCheckStrictly) {
+            const halfValues = rawHalfCheckedKeys.value
+              .map(key => {
+                const entity = getEntityByKey(key);
+                return entity ? entity.data.value : key;
+              })
+              .filter(val => !eventValues.includes(val));
+
+            returnValues = [
+              ...(returnValues as LabelValueType[]),
+              ...getRawValueLabeled(halfValues, preValue, getEntityByValue, getTreeNodeLabelProp),
+            ];
+          }
+
+          const additionalInfo = {
+            // [Legacy] Always return as array contains label & value
+            preValue: selectValues.value,
+            triggerValue,
+          } as ChangeEventExtra;
+
+          // [Legacy] Fill legacy data if user query.
+          // This is expansive that we only fill when user query
+          // https://github.com/react-component/tree-select/blob/fe33eb7c27830c9ac70cd1fdb1ebbe7bc679c16a/src/Select.jsx
+          let showPosition = true;
+          if (treeCheckStrictly || (source === 'selection' && !selected)) {
+            showPosition = false;
+          }
+
+          fillAdditionalInfo(
+            additionalInfo,
+            triggerValue,
+            newRawValues,
+            mergedTreeData.value,
+            showPosition,
+          );
+
+          if (mergedCheckable.value) {
+            additionalInfo.checked = selected;
+          } else {
+            additionalInfo.selected = selected;
+          }
+
+          onChange(
+            mergedMultiple.value ? returnValues : returnValues[0],
+            mergedLabelInValue.value
+              ? null
+              : eventValues.map(val => {
+                  const entity = getEntityByValue(val);
+                  return entity ? entity.data.title : null;
+                }),
+            additionalInfo,
+          );
+        }
+      };
+
+      const onInternalSelect = (
+        selectValue: RawValueType,
+        option: DataNode,
+        source: SelectSource,
+      ) => {
+        const eventValue = mergedLabelInValue.value ? selectValue : selectValue;
+
+        if (!mergedMultiple.value) {
+          // Single mode always set value
+          triggerChange([selectValue], { selected: true, triggerValue: selectValue }, source);
+        } else {
+          let newRawValues = addValue(rawValues.value, selectValue);
+
+          // Add keys if tree conduction
+          if (treeConduction.value) {
+            // Should keep missing values
+            const { missingRawValues, existRawValues } = splitRawValues(newRawValues);
+            const keyList = existRawValues.map(val => getEntityByValue(val).key);
+            const { checkedKeys } = conductCheck(keyList, true, conductKeyEntities.value);
+            newRawValues = [
+              ...missingRawValues,
+              ...checkedKeys.map(key => getEntityByKey(key).data.value),
+            ];
+          }
+
+          triggerChange(newRawValues, { selected: true, triggerValue: selectValue }, source);
+        }
+
+        props.onSelect?.(eventValue, option);
+      };
+
+      const onInternalDeselect = (
+        selectValue: RawValueType,
+        option: DataNode,
+        source: SelectSource,
+      ) => {
+        const eventValue = mergedLabelInValue.value ? selectValue : selectValue;
+
+        let newRawValues = removeValue(rawValues.value, selectValue);
+
+        // Remove keys if tree conduction
+        if (treeConduction.value) {
+          const { missingRawValues, existRawValues } = splitRawValues(newRawValues);
+          const keyList = existRawValues.map(val => getEntityByValue(val).key);
+          const { checkedKeys } = conductCheck(
+            keyList,
+            { checked: false, halfCheckedKeys: rawHalfCheckedKeys.value },
+            conductKeyEntities.value,
+          );
+          newRawValues = [
+            ...missingRawValues,
+            ...checkedKeys.map(key => getEntityByKey(key).data.value),
+          ];
+        }
+
+        triggerChange(newRawValues, { selected: false, triggerValue: selectValue }, source);
+
+        props.onDeselect?.(eventValue, option);
+      };
+
+      const onInternalClear = () => {
+        triggerChange([], null, 'clear');
+      };
+
+      // ========================= Open ==========================
+      const onInternalDropdownVisibleChange = (open: boolean) => {
+        if (props.onDropdownVisibleChange) {
+          const legacyParam = {};
+
+          Object.defineProperty(legacyParam, 'documentClickClose', {
+            get() {
+              warning(false, 'Second param of `onDropdownVisibleChange` has been removed.');
+              return false;
+            },
+          });
+
+          (props.onDropdownVisibleChange as any)(open, legacyParam);
+        }
+      };
+
+      // ======================== Warning ========================
+      if (process.env.NODE_ENV !== 'production') {
+        warningProps(props);
+      }
+
+      return () => {
+        const {
+          treeNodeFilterProp,
+          dropdownPopupAlign,
+          filterTreeNode,
+          treeDefaultExpandAll,
+          treeExpandedKeys,
+          treeDefaultExpandedKeys,
+          onTreeExpand,
+          treeIcon,
+          treeMotion,
+          showTreeIcon,
+          switcherIcon,
+          treeLine,
+          loadData,
+          treeLoadedKeys,
+          onTreeLoad,
+        } = props;
+        // ======================== Render =========================
+        // We pass some props into select props style
+        const selectProps = {
+          optionLabelProp: null,
+          optionFilterProp: treeNodeFilterProp,
+          dropdownAlign: dropdownPopupAlign,
+          internalProps: {
+            mark: INTERNAL_PROPS_MARK,
+            onClear: onInternalClear,
+            skipTriggerChange: true,
+            skipTriggerSelect: true,
+            onRawSelect: onInternalSelect,
+            onRawDeselect: onInternalDeselect,
+          },
+          filterOption: filterTreeNode,
+        };
+
+        if (props.filterTreeNode === undefined) {
+          delete selectProps.filterOption;
+        }
+        const selectContext = {
+          checkable: mergedCheckable.value,
+          loadData,
+          treeLoadedKeys,
+          onTreeLoad,
+          checkedKeys: rawValues.value,
+          halfCheckedKeys: rawHalfCheckedKeys.value,
+          treeDefaultExpandAll,
+          treeExpandedKeys,
+          treeDefaultExpandedKeys,
+          onTreeExpand,
+          treeIcon,
+          treeMotion,
+          showTreeIcon,
+          switcherIcon,
+          treeLine,
+          treeNodeFilterProp,
+          getEntityByKey,
+          getEntityByValue,
+          customCheckable: slots.checkable,
+          slots,
+        };
+        return (
+          <SelectContext value={selectContext}>
+            <RefSelect
+              {...attrs}
+              ref={selectRef}
+              mode={mergedMultiple.value ? 'multiple' : null}
+              {...props}
+              {...selectProps}
+              value={selectValues}
+              // We will handle this ourself since we need calculate conduction
+              labelInValue
+              options={mergedTreeData.value}
+              onChange={null}
+              onSelect={null}
+              onDeselect={null}
+              onDropdownVisibleChange={onInternalDropdownVisibleChange}
+            />
+          </SelectContext>
+        );
       };
     },
   });
diff --git a/components/vc-tree-select/props.ts b/components/vc-tree-select/props.ts
index eee712a9c..b13d548ea 100644
--- a/components/vc-tree-select/props.ts
+++ b/components/vc-tree-select/props.ts
@@ -1,5 +1,5 @@
 import type { ExtractPropTypes, PropType } from 'vue';
-import type { DataNode } from '../tree';
+import type { DataNode } from './interface';
 import { selectBaseProps } from '../vc-select';
 import type { FilterFunc } from '../vc-select/interface/generator';
 import omit from '../_util/omit';
@@ -87,9 +87,9 @@ export function treeSelectProps<ValueType = DefaultValueType>() {
       type: [Boolean, Object] as PropType<boolean | SimpleModeConfig>,
       default: undefined,
     },
-    treeExpandedKeys: { type: [String, Number] as PropType<Key> },
-    treeDefaultExpandedKeys: { type: [String, Number] as PropType<Key> },
-    treeLoadedKeys: { type: [String, Number] as PropType<Key> },
+    treeExpandedKeys: { type: Array as PropType<Key[]> },
+    treeDefaultExpandedKeys: { type: Array as PropType<Key[]> },
+    treeLoadedKeys: { type: Array as PropType<Key[]> },
     treeCheckable: { type: Boolean, default: undefined },
     treeCheckStrictly: { type: Boolean, default: undefined },
     showCheckedStrategy: { type: String as PropType<CheckedStrategy> },
diff --git a/components/vc-tree/interface.tsx b/components/vc-tree/interface.tsx
index a84e92e00..40aeda5ed 100644
--- a/components/vc-tree/interface.tsx
+++ b/components/vc-tree/interface.tsx
@@ -21,19 +21,19 @@ export interface DataNode {
 }
 
 export interface EventDataNode extends DataNode {
-  expanded: boolean;
-  selected: boolean;
+  expanded?: boolean;
+  selected?: boolean;
   checked: boolean;
-  loaded: boolean;
-  loading: boolean;
-  halfChecked: boolean;
-  dragOver: boolean;
-  dragOverGapTop: boolean;
-  dragOverGapBottom: boolean;
-  pos: string;
-  active: boolean;
-  dataRef: DataNode;
-  eventKey: Key; // 兼容 v2， 推荐直接用 key
+  loaded?: boolean;
+  loading?: boolean;
+  halfChecked?: boolean;
+  dragOver?: boolean;
+  dragOverGapTop?: boolean;
+  dragOverGapBottom?: boolean;
+  pos?: string;
+  active?: boolean;
+  dataRef?: DataNode;
+  eventKey?: Key; // 兼容 v2， 推荐直接用 key
 }
 
 export type IconType = any;
diff --git a/components/vc-tree/props.ts b/components/vc-tree/props.ts
index cacaa58e3..ecce7f459 100644
--- a/components/vc-tree/props.ts
+++ b/components/vc-tree/props.ts
@@ -43,7 +43,7 @@ export const treeNodeProps = {
   pos: String,
 
   /** New added in Tree for easy data access */
-  data: { type: Object as PropType<DataNode> },
+  data: { type: Object as PropType<DataNode>, default: undefined as DataNode },
   isStart: { type: Array as PropType<boolean[]> },
   isEnd: { type: Array as PropType<boolean[]> },
   active: { type: Boolean, default: undefined },