diff --git a/src/main/java/run/halo/app/controller/admin/api/InstallController.java b/src/main/java/run/halo/app/controller/admin/api/InstallController.java
index a5208f368..2ad1661ba 100644
--- a/src/main/java/run/halo/app/controller/admin/api/InstallController.java
+++ b/src/main/java/run/halo/app/controller/admin/api/InstallController.java
@@ -1,5 +1,7 @@
 package run.halo.app.controller.admin.api;
 
+import cn.hutool.core.text.StrBuilder;
+import cn.hutool.crypto.SecureUtil;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.context.ApplicationEventPublisher;
@@ -196,11 +198,15 @@ public class InstallController {
             installParam.update(user);
             // Set password manually
             userService.setPassword(user, installParam.getPassword());
-            // Set default avatar
-            userService.setDefaultAvatar(user);
             // Update user
             return userService.update(user);
-        }).orElseGet(() -> userService.createBy(installParam));
+        }).orElseGet(() -> {
+            StrBuilder gravatar = new StrBuilder("//cn.gravatar.com/avatar/");
+            gravatar.append(SecureUtil.md5(installParam.getEmail()));
+            gravatar.append("?s=256&d=mm");
+            installParam.setAvatar(gravatar.toString());
+            return userService.createBy(installParam);
+        });
     }
 
     private void initSettings(InstallParam installParam) {
diff --git a/src/main/java/run/halo/app/controller/admin/api/PostController.java b/src/main/java/run/halo/app/controller/admin/api/PostController.java
index 2db8c2f4b..79d1642ef 100644
--- a/src/main/java/run/halo/app/controller/admin/api/PostController.java
+++ b/src/main/java/run/halo/app/controller/admin/api/PostController.java
@@ -2,8 +2,11 @@ package run.halo.app.controller.admin.api;
 
 import io.swagger.annotations.ApiOperation;
 import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.data.web.PageableDefault;
+import org.springframework.data.web.SortDefault;
 import org.springframework.web.bind.annotation.*;
 import run.halo.app.model.dto.post.BasePostMinimalDTO;
 import run.halo.app.model.dto.post.BasePostSimpleDTO;
@@ -24,6 +27,7 @@ import static org.springframework.data.domain.Sort.Direction.DESC;
  * Post controller.
  *
  * @author johnniang
+ * @author ryanwang
  * @date 3/19/19
  */
 @RestController
@@ -38,8 +42,13 @@ public class PostController {
 
     @GetMapping
     @ApiOperation("Lists posts")
-    public Page<PostListVO> pageBy(@PageableDefault(sort = "createTime", direction = DESC) Pageable pageable,
+    public Page<PostListVO> pageBy(Integer page, Integer size,
+                                   @SortDefault.SortDefaults({
+                                           @SortDefault(sort = "topPriority", direction = DESC),
+                                           @SortDefault(sort = "createTime", direction = DESC)
+                                   }) Sort sort,
                                    PostQuery postQuery) {
+        Pageable pageable = PageRequest.of(page, size, sort);
         Page<Post> postPage = postService.pageBy(postQuery, pageable);
         return postService.convertToListVo(postPage);
     }
diff --git a/src/main/java/run/halo/app/controller/admin/api/ThemeController.java b/src/main/java/run/halo/app/controller/admin/api/ThemeController.java
index c97ea5013..452d7447c 100644
--- a/src/main/java/run/halo/app/controller/admin/api/ThemeController.java
+++ b/src/main/java/run/halo/app/controller/admin/api/ThemeController.java
@@ -47,7 +47,7 @@ public class ThemeController {
         return themeService.getThemes();
     }
 
-    @GetMapping("files")
+    @GetMapping("activation/files")
     public List<ThemeFile> listFiles() {
         return themeService.listThemeFolderBy(themeService.getActivatedThemeId());
     }