diff --git a/src/main/java/run/halo/app/controller/admin/api/LinkController.java b/src/main/java/run/halo/app/controller/admin/api/LinkController.java
index a42f4ff8d..a9f6bff25 100644
--- a/src/main/java/run/halo/app/controller/admin/api/LinkController.java
+++ b/src/main/java/run/halo/app/controller/admin/api/LinkController.java
@@ -54,9 +54,8 @@ public class LinkController {
     @ApiOperation("Updates a link")
     public LinkDTO updateBy(@PathVariable("id") Integer id,
             @RequestBody @Valid LinkParam linkParam) {
-        Link link = linkService.getById(id);
-        linkParam.update(link);
-        return new LinkDTO().convertFrom(linkService.update(link));
+        Link link = linkService.updateBy(id, linkParam);
+        return new LinkDTO().convertFrom(link);
     }
 
     @DeleteMapping("{id:\\d+}")
diff --git a/src/main/java/run/halo/app/repository/LinkRepository.java b/src/main/java/run/halo/app/repository/LinkRepository.java
index fbfe8aed7..f54d9dfc2 100755
--- a/src/main/java/run/halo/app/repository/LinkRepository.java
+++ b/src/main/java/run/halo/app/repository/LinkRepository.java
@@ -20,4 +20,8 @@ public interface LinkRepository extends BaseRepository<Link, Integer> {
      */
     @Query(value = "select distinct a.team from Link a")
     List<String> findAllTeams();
+
+    boolean existsByNameAndIdNot(String name, Integer id);
+
+    boolean existsByUrlAndIdNot(String url, Integer id);
 }
diff --git a/src/main/java/run/halo/app/service/LinkService.java b/src/main/java/run/halo/app/service/LinkService.java
index a0e37e25e..82f83880f 100755
--- a/src/main/java/run/halo/app/service/LinkService.java
+++ b/src/main/java/run/halo/app/service/LinkService.java
@@ -55,6 +55,17 @@ public interface LinkService extends CrudService<Link, Integer> {
     @NonNull
     Link createBy(@NonNull LinkParam linkParam);
 
+    /**
+     * Updates link by link param.
+     *
+     *
+     * @param id must not be null
+     * @param linkParam must not be null
+     * @return updated link
+     */
+    @NonNull
+    Link updateBy(Integer id, @NonNull LinkParam linkParam);
+
     /**
      * Exists by link name.
      *
@@ -63,6 +74,14 @@ public interface LinkService extends CrudService<Link, Integer> {
      */
     boolean existByName(String name);
 
+    /**
+     * Exists by link url.
+     *
+     * @param url must not be blank
+     * @return true if exists; false otherwise
+     */
+    boolean existByUrl(String url);
+
     /**
      * List all link teams.
      *
diff --git a/src/main/java/run/halo/app/service/impl/LinkServiceImpl.java b/src/main/java/run/halo/app/service/impl/LinkServiceImpl.java
index 02d0fa8da..b5cd33908 100644
--- a/src/main/java/run/halo/app/service/impl/LinkServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/LinkServiceImpl.java
@@ -101,9 +101,39 @@ public class LinkServiceImpl extends AbstractCrudService<Link, Integer> implemen
             throw new AlreadyExistsException("友情链接 " + linkParam.getName() + " 已存在").setErrorData(linkParam.getName());
         }
 
+        // Check the url
+        exist = existByUrl(linkParam.getUrl());
+
+        if (exist) {
+            throw new AlreadyExistsException("友情链接 " + linkParam.getUrl() + " 已存在").setErrorData(linkParam.getUrl());
+        }
+
         return create(linkParam.convertTo());
     }
 
+    @Override
+    public @NotNull Link updateBy(Integer id, @NotNull LinkParam linkParam) {
+        Assert.notNull(id, "Id must not be null");
+        Assert.notNull(linkParam, "Link param must not be null");
+
+        // Check the name
+        boolean exist = linkRepository.existsByNameAndIdNot(linkParam.getName(), id);
+        if (exist) {
+            throw new AlreadyExistsException("友情链接 " + linkParam.getName() + " 已存在").setErrorData(linkParam.getName());
+        }
+
+        // Check the url
+        exist = linkRepository.existsByUrlAndIdNot(linkParam.getUrl(), id);
+        if (exist) {
+            throw new AlreadyExistsException("友情链接 " + linkParam.getUrl() + " 已存在").setErrorData(linkParam.getUrl());
+        }
+
+        Link link = getById(id);
+        linkParam.update(link);
+
+        return update(link);
+    }
+
     @Override
     public boolean existByName(String name) {
         Assert.hasText(name, "Link name must not be blank");
@@ -113,6 +143,15 @@ public class LinkServiceImpl extends AbstractCrudService<Link, Integer> implemen
         return linkRepository.exists(Example.of(link));
     }
 
+    @Override
+    public boolean existByUrl(String url) {
+        Assert.hasText(url, "Link url must not be blank");
+        Link link = new Link();
+        link.setUrl(url);
+
+        return linkRepository.exists(Example.of(link));
+    }
+
     @Override
     public List<String> listAllTeams() {
         return linkRepository.findAllTeams();