diff --git a/src/main/java/run/halo/app/service/impl/BasePostServiceImpl.java b/src/main/java/run/halo/app/service/impl/BasePostServiceImpl.java
index b58d17f78..ee36ee138 100644
--- a/src/main/java/run/halo/app/service/impl/BasePostServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/BasePostServiceImpl.java
@@ -7,7 +7,6 @@ import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
 import org.springframework.lang.NonNull;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import run.halo.app.exception.AlreadyExistsException;
@@ -24,6 +23,7 @@ import run.halo.app.service.OptionService;
 import run.halo.app.service.base.AbstractCrudService;
 import run.halo.app.service.base.BasePostService;
 import run.halo.app.utils.DateUtils;
+import run.halo.app.utils.HaloUtils;
 import run.halo.app.utils.MarkdownUtils;
 import run.halo.app.utils.ServiceUtils;
 
@@ -40,6 +40,7 @@ import static org.springframework.data.domain.Sort.Direction.DESC;
  * Base post service implementation.
  *
  * @author johnniang
+ * @author ryanwang
  * @date 2019-04-24
  */
 @Slf4j
@@ -275,7 +276,7 @@ public abstract class BasePostServiceImpl<POST extends BasePost> extends Abstrac
 
         // Set summary
         if (StringUtils.isBlank(basePostSimpleDTO.getSummary())) {
-            // TODO build post summary
+            basePostSimpleDTO.setSummary(generateSummary(post.getFormatContent()));
         }
 
         return basePostSimpleDTO;
@@ -347,12 +348,14 @@ public abstract class BasePostServiceImpl<POST extends BasePost> extends Abstrac
     }
 
     @NonNull
-    protected String convertToSummary(@Nullable String markdownContent) {
+    protected String generateSummary(@NonNull String htmlContent) {
+        Assert.notNull(htmlContent, "html content must not be null");
+
+        String text = HaloUtils.cleanHtmlTag(htmlContent);
+
         // Get summary length
         Integer summaryLength = optionService.getByPropertyOrDefault(PostProperties.SUMMARY_LENGTH, Integer.class, 150);
 
-        // TODO build summary.
-        return "";
+        return StringUtils.substring(text, 0, summaryLength);
     }
-
 }
diff --git a/src/main/java/run/halo/app/service/impl/PostServiceImpl.java b/src/main/java/run/halo/app/service/impl/PostServiceImpl.java
index 7493bfa89..dd9d52e30 100644
--- a/src/main/java/run/halo/app/service/impl/PostServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/PostServiceImpl.java
@@ -463,7 +463,7 @@ public class PostServiceImpl extends BasePostServiceImpl<Post> implements PostSe
             PostListVO postListVO = new PostListVO().convertFrom(post);
 
             if (StringUtils.isBlank(postListVO.getSummary())) {
-                // TODO Set summary
+                postListVO.setSummary(generateSummary(post.getFormatContent()));
             }
 
             Optional.ofNullable(tagListMap.get(post.getId())).orElseGet(LinkedList::new);
diff --git a/src/main/java/run/halo/app/utils/HaloUtils.java b/src/main/java/run/halo/app/utils/HaloUtils.java
index 5aeb6a35d..ab58e4ad4 100755
--- a/src/main/java/run/halo/app/utils/HaloUtils.java
+++ b/src/main/java/run/halo/app/utils/HaloUtils.java
@@ -8,7 +8,6 @@ import org.springframework.util.Assert;
 
 import java.net.InetAddress;
 import java.net.UnknownHostException;
-import java.nio.file.Path;
 import java.util.UUID;
 
 import static run.halo.app.model.support.HaloConst.FILE_SEPARATOR;
@@ -17,11 +16,14 @@ import static run.halo.app.model.support.HaloConst.FILE_SEPARATOR;
  * Common utils
  *
  * @author ryanwang
+ * @author johnniang
  * @date : 2017/12/22
  */
 @Slf4j
 public class HaloUtils {
 
+    private static final String RE_HTML_MARK = "(<[^<]*?>)|(<[\\s]*?/[^<]*?>)|(<[^<]*?/[\\s]*?>)";
+
     /**
      * Desensitizes the plain text.
      *
@@ -192,4 +194,14 @@ public class HaloUtils {
         }
         return machineAddress.getHostAddress();
     }
+
+    /**
+     * Clean all html tag
+     *
+     * @param content html document
+     * @return text before cleaned
+     */
+    public static String cleanHtmlTag(String content) {
+        return content.replaceAll(RE_HTML_MARK, "");
+    }
 }