diff --git a/pom.xml b/pom.xml
index 42152d9e7..d228f4a0e 100755
--- a/pom.xml
+++ b/pom.xml
@@ -49,6 +49,7 @@
         <thumbnailator.version>0.4.8</thumbnailator.version>
         <commonmark.version>0.12.1</commonmark.version>
         <commons-lang3.version>3.8.1</commons-lang3.version>
+        <slugify.version>2.3</slugify.version>
     </properties>
 
     <dependencies>
diff --git a/src/main/java/cc/ryanc/halo/model/dto/TagWithCountOutputDTO.java b/src/main/java/cc/ryanc/halo/model/dto/TagWithCountOutputDTO.java
new file mode 100644
index 000000000..8236c8f32
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/model/dto/TagWithCountOutputDTO.java
@@ -0,0 +1,16 @@
+package cc.ryanc.halo.model.dto;
+
+import lombok.Data;
+
+/**
+ * Tag with post count output dto.
+ *
+ * @author johnniang
+ * @date 3/20/19
+ */
+@Data
+public class TagWithCountOutputDTO extends TagOutputDTO {
+
+    private Long postCount;
+
+}
diff --git a/src/main/java/cc/ryanc/halo/model/entity/Attachment.java b/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
index bad0f29ee..c65df426a 100644
--- a/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
+++ b/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
@@ -7,7 +7,6 @@ import org.hibernate.annotations.SQLDelete;
 import org.hibernate.annotations.Where;
 
 import javax.persistence.*;
-import java.time.Instant;
 
 /**
  * Attachment entity
diff --git a/src/main/java/cc/ryanc/halo/model/params/TagParam.java b/src/main/java/cc/ryanc/halo/model/params/TagParam.java
new file mode 100644
index 000000000..8901bfeef
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/model/params/TagParam.java
@@ -0,0 +1,36 @@
+package cc.ryanc.halo.model.params;
+
+import cc.ryanc.halo.model.dto.base.InputConverter;
+import cc.ryanc.halo.model.entity.Tag;
+import cc.ryanc.halo.utils.SlugUtils;
+import lombok.Data;
+import org.apache.commons.lang3.StringUtils;
+
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+
+/**
+ * Tag param.
+ *
+ * @author johnniang
+ * @date 3/20/19
+ */
+@Data
+public class TagParam implements InputConverter<Tag> {
+
+    @NotBlank(message = "Tag name must not be blank")
+    @Size(max = 255, message = "Length of tag name must not be more than {max}")
+    private String name;
+
+    @Size(max = 255, message = "Length of tag slug name must not be more than {max}")
+    private String slugName;
+
+    @Override
+    public Tag convertTo() {
+        if (StringUtils.isBlank(slugName)) {
+            // Handle slug name
+            slugName = SlugUtils.slugify(name);
+        }
+        return InputConverter.super.convertTo();
+    }
+}
diff --git a/src/main/java/cc/ryanc/halo/repository/PostTagRepository.java b/src/main/java/cc/ryanc/halo/repository/PostTagRepository.java
index 4423bded4..f4abc2a76 100644
--- a/src/main/java/cc/ryanc/halo/repository/PostTagRepository.java
+++ b/src/main/java/cc/ryanc/halo/repository/PostTagRepository.java
@@ -62,4 +62,5 @@ public interface PostTagRepository extends BaseRepository<PostTag, Integer> {
      */
     @NonNull
     List<PostTag> findAllByPostIdIn(@NonNull Iterable<Integer> postIds);
+
 }
diff --git a/src/main/java/cc/ryanc/halo/repository/TagRepository.java b/src/main/java/cc/ryanc/halo/repository/TagRepository.java
index 43f7796d5..11e1881e5 100644
--- a/src/main/java/cc/ryanc/halo/repository/TagRepository.java
+++ b/src/main/java/cc/ryanc/halo/repository/TagRepository.java
@@ -2,6 +2,7 @@ package cc.ryanc.halo.repository;
 
 import cc.ryanc.halo.model.entity.Tag;
 import cc.ryanc.halo.repository.base.BaseRepository;
+import org.springframework.lang.NonNull;
 
 /**
  * Tag repository.
@@ -10,4 +11,12 @@ import cc.ryanc.halo.repository.base.BaseRepository;
  */
 public interface TagRepository extends BaseRepository<Tag, Integer> {
 
+    /**
+     * Count by name or slug name.
+     *
+     * @param name     tag name must not be null
+     * @param slugName tag slug name must not be null
+     * @return tag count
+     */
+    long countByNameOrSlugName(@NonNull String name, @NonNull String slugName);
 }
diff --git a/src/main/java/cc/ryanc/halo/service/PostTagService.java b/src/main/java/cc/ryanc/halo/service/PostTagService.java
index e55708be8..1b45aef1d 100644
--- a/src/main/java/cc/ryanc/halo/service/PostTagService.java
+++ b/src/main/java/cc/ryanc/halo/service/PostTagService.java
@@ -1,9 +1,11 @@
 package cc.ryanc.halo.service;
 
+import cc.ryanc.halo.model.dto.TagWithCountOutputDTO;
 import cc.ryanc.halo.model.entity.Post;
 import cc.ryanc.halo.model.entity.PostTag;
 import cc.ryanc.halo.model.entity.Tag;
 import cc.ryanc.halo.service.base.CrudService;
+import org.springframework.data.domain.Sort;
 import org.springframework.lang.NonNull;
 
 import java.util.Collection;
@@ -25,10 +27,19 @@ public interface PostTagService extends CrudService<PostTag, Integer> {
      * @return a list of tag
      */
     @NonNull
-    List<Tag> listTagBy(@NonNull Integer postId);
+    List<Tag> listTagsBy(@NonNull Integer postId);
 
     /**
-     * Lists tag list map by post id.
+     * List tag with post count output dtos.
+     *
+     * @param sort sort info
+     * @return a list of tag with post count output dto
+     */
+    @NonNull
+    List<TagWithCountOutputDTO> listTagWithCountDtos(@NonNull Sort sort);
+
+    /**
+     * Lists tags list map by post id.
      *
      * @param postIds post id collection
      * @return tag map (key: postId, value: a list of tags)
@@ -37,12 +48,12 @@ public interface PostTagService extends CrudService<PostTag, Integer> {
     Map<Integer, List<Tag>> listTagListMapBy(Collection<Integer> postIds);
 
     /**
-     * Lists post by tag id.
+     * Lists posts by tag id.
      *
      * @param tagId tag id must not be null
      * @return a list of post
      */
     @NonNull
-    List<Post> listPostBy(@NonNull Integer tagId);
+    List<Post> listPostsBy(@NonNull Integer tagId);
 
 }
diff --git a/src/main/java/cc/ryanc/halo/service/impl/PostTagServiceImpl.java b/src/main/java/cc/ryanc/halo/service/impl/PostTagServiceImpl.java
index efbcd6025..c6cb01608 100644
--- a/src/main/java/cc/ryanc/halo/service/impl/PostTagServiceImpl.java
+++ b/src/main/java/cc/ryanc/halo/service/impl/PostTagServiceImpl.java
@@ -1,5 +1,6 @@
 package cc.ryanc.halo.service.impl;
 
+import cc.ryanc.halo.model.dto.TagWithCountOutputDTO;
 import cc.ryanc.halo.model.entity.Post;
 import cc.ryanc.halo.model.entity.PostTag;
 import cc.ryanc.halo.model.entity.Tag;
@@ -9,11 +10,13 @@ import cc.ryanc.halo.repository.TagRepository;
 import cc.ryanc.halo.service.PostTagService;
 import cc.ryanc.halo.service.base.AbstractCrudService;
 import cc.ryanc.halo.utils.ServiceUtils;
+import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * Post tag service implementation.
@@ -40,7 +43,7 @@ public class PostTagServiceImpl extends AbstractCrudService<PostTag, Integer> im
     }
 
     @Override
-    public List<Tag> listTagBy(Integer postId) {
+    public List<Tag> listTagsBy(Integer postId) {
         Assert.notNull(postId, "Post id must not be null");
 
         // Find all tag ids
@@ -49,6 +52,21 @@ public class PostTagServiceImpl extends AbstractCrudService<PostTag, Integer> im
         return tagRepository.findAllById(tagIds);
     }
 
+    @Override
+    public List<TagWithCountOutputDTO> listTagWithCountDtos(Sort sort) {
+        Assert.notNull(sort, "Sort info must not be null");
+
+        // Find all tags
+        List<Tag> tags = tagRepository.findAll(sort);
+
+        // Find post count
+        return tags.stream().map(tag -> {
+            TagWithCountOutputDTO tagOutputDTO = new TagWithCountOutputDTO().convertFrom(tag);
+
+            return tagOutputDTO;
+        }).collect(Collectors.toList());
+    }
+
     @Override
     public Map<Integer, List<Tag>> listTagListMapBy(Collection<Integer> postIds) {
         if (CollectionUtils.isEmpty(postIds)) {
@@ -78,7 +96,7 @@ public class PostTagServiceImpl extends AbstractCrudService<PostTag, Integer> im
 
 
     @Override
-    public List<Post> listPostBy(Integer tagId) {
+    public List<Post> listPostsBy(Integer tagId) {
         Assert.notNull(tagId, "Tag id must not be null");
 
         // Find all post ids
diff --git a/src/main/java/cc/ryanc/halo/service/impl/TagServiceImpl.java b/src/main/java/cc/ryanc/halo/service/impl/TagServiceImpl.java
index f149acbf6..78a487e52 100644
--- a/src/main/java/cc/ryanc/halo/service/impl/TagServiceImpl.java
+++ b/src/main/java/cc/ryanc/halo/service/impl/TagServiceImpl.java
@@ -1,9 +1,11 @@
 package cc.ryanc.halo.service.impl;
 
+import cc.ryanc.halo.exception.AlreadyExistsException;
 import cc.ryanc.halo.model.entity.Tag;
 import cc.ryanc.halo.repository.TagRepository;
 import cc.ryanc.halo.service.TagService;
 import cc.ryanc.halo.service.base.AbstractCrudService;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
 /**
@@ -12,6 +14,7 @@ import org.springframework.stereotype.Service;
  * @author : RYAN0UP
  * @date : 2019-03-14
  */
+@Slf4j
 @Service
 public class TagServiceImpl extends AbstractCrudService<Tag, Integer> implements TagService {
 
@@ -29,6 +32,22 @@ public class TagServiceImpl extends AbstractCrudService<Tag, Integer> implements
      */
     @Override
     public void remove(Integer id) {
-         // TODO 删除标签，以及对应的文章关系
+        // TODO 删除标签，以及对应的文章关系
+    }
+
+    @Override
+    public Tag create(Tag tag) {
+        // Check if the tag is exist
+        long count = tagRepository.countByNameOrSlugName(tag.getName(), tag.getSlugName());
+
+        log.debug("Tag count: [{}]", count);
+
+        if (count > 0) {
+            // If the tag has exist already
+            throw new AlreadyExistsException("The tag has already exist").setErrorData(tag);
+        }
+
+        // Get tag name
+        return super.create(tag);
     }
 }
diff --git a/src/main/java/cc/ryanc/halo/utils/SlugUtils.java b/src/main/java/cc/ryanc/halo/utils/SlugUtils.java
new file mode 100644
index 000000000..6efd7d435
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/utils/SlugUtils.java
@@ -0,0 +1,29 @@
+package cc.ryanc.halo.utils;
+
+import org.springframework.lang.NonNull;
+import org.springframework.util.Assert;
+
+import java.text.Normalizer;
+import java.util.Locale;
+import java.util.regex.Pattern;
+
+/**
+ * Slugify utilities.
+ *
+ * @author johnniang
+ * @date 3/20/19
+ */
+public class SlugUtils {
+
+    private static final Pattern NON_LATIN = Pattern.compile("[^\\w-]");
+    private static final Pattern WHITESPACE = Pattern.compile("[\\s]");
+
+    public static String slugify(@NonNull String input) {
+        Assert.hasText(input, "Input string must not be blank");
+
+        String withoutWhitespace = WHITESPACE.matcher(input).replaceAll("-");
+        String normalized = Normalizer.normalize(withoutWhitespace, Normalizer.Form.NFKD);
+        String slug = NON_LATIN.matcher(normalized).replaceAll("");
+        return slug.toLowerCase(Locale.ENGLISH);
+    }
+}
diff --git a/src/main/java/cc/ryanc/halo/web/controller/admin/api/TagController.java b/src/main/java/cc/ryanc/halo/web/controller/admin/api/TagController.java
new file mode 100644
index 000000000..c896a1e79
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/web/controller/admin/api/TagController.java
@@ -0,0 +1,48 @@
+package cc.ryanc.halo.web.controller.admin.api;
+
+import cc.ryanc.halo.model.dto.TagOutputDTO;
+import cc.ryanc.halo.model.entity.Tag;
+import cc.ryanc.halo.model.params.TagParam;
+import cc.ryanc.halo.service.TagService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.web.SortDefault;
+import org.springframework.web.bind.annotation.*;
+
+import javax.validation.Valid;
+import java.util.List;
+
+/**
+ * Tag controller.
+ *
+ * @author johnniang
+ * @date 3/20/19
+ */
+@Slf4j
+@RestController
+@RequestMapping("/admin/api/tags")
+public class TagController {
+
+    private final TagService tagService;
+
+    public TagController(TagService tagService) {
+        this.tagService = tagService;
+    }
+
+    @GetMapping
+    public List<TagOutputDTO> listTags(@SortDefault(sort = "updateTime", direction = Sort.Direction.DESC) Sort sort) {
+
+        return null;
+    }
+
+    @PostMapping
+    public TagOutputDTO createTag(@Valid @RequestBody TagParam tagParam) {
+        // Convert to tag
+        Tag tag = tagParam.convertTo();
+
+        log.debug("Tag to be created: [{}]", tag);
+
+        // Create and convert
+        return new TagOutputDTO().convertFrom(tagService.create(tag));
+    }
+}
diff --git a/src/test/java/cc/ryanc/halo/utils/SlugUtilsTest.java b/src/test/java/cc/ryanc/halo/utils/SlugUtilsTest.java
new file mode 100644
index 000000000..839f297d7
--- /dev/null
+++ b/src/test/java/cc/ryanc/halo/utils/SlugUtilsTest.java
@@ -0,0 +1,21 @@
+package cc.ryanc.halo.utils;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.*;
+
+/**
+ * @author johnniang
+ * @date 3/20/19
+ */
+public class SlugUtilsTest {
+
+    @Test
+    public void makeSlugTest() {
+        String slugResult = SlugUtils.slugify("Hello World");
+
+        Assert.assertThat(slugResult, equalTo("hello-world"));
+    }
+}
\ No newline at end of file