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 a7226e58e..5465b0585 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
@@ -196,6 +196,8 @@ 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));
diff --git a/src/main/java/run/halo/app/service/UserService.java b/src/main/java/run/halo/app/service/UserService.java
index e992670a8..91698a131 100755
--- a/src/main/java/run/halo/app/service/UserService.java
+++ b/src/main/java/run/halo/app/service/UserService.java
@@ -122,4 +122,11 @@ public interface UserService extends CrudService<User, Integer> {
      * @param plainPassword plain password must not be blank
      */
     void setPassword(@NonNull User user, @NonNull String plainPassword);
+
+    /**
+     * Set user default avatar，use Gavatar(http://cn.gravatar.com)
+     *
+     * @param user user must not be null
+     */
+    void setDefaultAvatar(@NonNull User user);
 }
diff --git a/src/main/java/run/halo/app/service/impl/UserServiceImpl.java b/src/main/java/run/halo/app/service/impl/UserServiceImpl.java
index 96b49b401..66ed2da84 100644
--- a/src/main/java/run/halo/app/service/impl/UserServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/UserServiceImpl.java
@@ -1,5 +1,7 @@
 package run.halo.app.service.impl;
 
+import cn.hutool.core.text.StrBuilder;
+import cn.hutool.crypto.SecureUtil;
 import cn.hutool.crypto.digest.BCrypt;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.context.ApplicationEventPublisher;
@@ -193,4 +195,12 @@ public class UserServiceImpl extends AbstractCrudService<User, Integer> implemen
         user.setPassword(BCrypt.hashpw(plainPassword, BCrypt.gensalt()));
     }
 
+    @Override
+    public void setDefaultAvatar(User user) {
+        Assert.notNull(user, "User must not be null");
+        StrBuilder gravatar = new StrBuilder("//cn.gravatar.com/avatar/");
+        gravatar.append(SecureUtil.md5(user.getEmail()));
+        gravatar.append("?s=256&d=mm");
+        user.setAvatar(gravatar.toString());
+    }
 }