diff --git a/internal/base/constant/site_info.go b/internal/base/constant/site_info.go
index e6b8cd99..88f3a4d8 100644
--- a/internal/base/constant/site_info.go
+++ b/internal/base/constant/site_info.go
@@ -1,6 +1,7 @@
 package constant
 
 var (
-	DefaultAvatar  = "system"
-	DefaultSiteURL = ""
+	DefaultAvatar          = "system"
+	DefaultGravatarBaseURL = "https://www.gravatar.com/avatar/"
+	DefaultSiteURL         = ""
 )
diff --git a/internal/migrations/init.go b/internal/migrations/init.go
index d47014f9..5ecf1d04 100644
--- a/internal/migrations/init.go
+++ b/internal/migrations/init.go
@@ -182,6 +182,7 @@ func initSiteInfo(engine *xorm.Engine, language, siteName, siteURL, contactEmail
 
 	usersData := map[string]any{
 		"default_avatar":            "gravatar",
+		"default_gravatar_base_url": "https://www.gravatar.com/avatar/",
 		"allow_update_display_name": true,
 		"allow_update_username":     true,
 		"allow_update_avatar":       true,
diff --git a/internal/migrations/migrations.go b/internal/migrations/migrations.go
index 20e07eb2..1a5b214e 100644
--- a/internal/migrations/migrations.go
+++ b/internal/migrations/migrations.go
@@ -56,12 +56,13 @@ var migrations = []Migration{
 	NewMigration("add user role", addRoleFeatures, false),
 	NewMigration("add theme and private mode", addThemeAndPrivateMode, true),
 	NewMigration("add new answer notification", addNewAnswerNotification, true),
+	NewMigration("add plugin", addPlugin, false),
 	NewMigration("add user pin hide features", addRolePinAndHideFeatures, true),
 	NewMigration("update accept answer rank", updateAcceptAnswerRank, true),
-	NewMigration("add plugin", addPlugin, false),
+	NewMigration("add login limitations", addLoginLimitations, true),
 	NewMigration("update user pin hide features", updateRolePinAndHideFeatures, true),
 	NewMigration("update question post time", updateQuestionPostTime, true),
-	NewMigration("add login limitations", addLoginLimitations, true),
+	NewMigration("add gravatar base url", addGravatarBaseURL, false),
 }
 
 // GetCurrentDBVersion returns the current db version
diff --git a/internal/migrations/v13.go b/internal/migrations/v13.go
new file mode 100644
index 00000000..278b1826
--- /dev/null
+++ b/internal/migrations/v13.go
@@ -0,0 +1,34 @@
+package migrations
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/answerdev/answer/internal/base/constant"
+	"github.com/answerdev/answer/internal/entity"
+	"github.com/answerdev/answer/internal/schema"
+	"xorm.io/xorm"
+)
+
+func addGravatarBaseURL(x *xorm.Engine) error {
+	usersSiteInfo := &entity.SiteInfo{
+		Type: constant.SiteTypeUsers,
+	}
+	exist, err := x.Get(usersSiteInfo)
+	if err != nil {
+		return fmt.Errorf("get config failed: %w", err)
+	}
+	if exist {
+		content := &schema.SiteUsersReq{}
+		_ = json.Unmarshal([]byte(usersSiteInfo.Content), content)
+		content.GravatarBaseURL = "https://www.gravatar.com/avatar/"
+		data, _ := json.Marshal(content)
+		usersSiteInfo.Content = string(data)
+
+		_, err = x.ID(usersSiteInfo.ID).Cols("content").Update(usersSiteInfo)
+		if err != nil {
+			return fmt.Errorf("update site info failed: %w", err)
+		}
+	}
+	return nil
+}
diff --git a/internal/schema/siteinfo_schema.go b/internal/schema/siteinfo_schema.go
index f0b659e3..6f8557fc 100644
--- a/internal/schema/siteinfo_schema.go
+++ b/internal/schema/siteinfo_schema.go
@@ -94,13 +94,14 @@ type GetSiteLegalInfoResp struct {
 
 // SiteUsersReq site users config request
 type SiteUsersReq struct {
-	DefaultAvatar          string `validate:"required,oneof=system gravatar" form:"default_avatar" json:"default_avatar"`
-	AllowUpdateDisplayName bool   `form:"allow_update_display_name" json:"allow_update_display_name"`
-	AllowUpdateUsername    bool   `form:"allow_update_username" json:"allow_update_username"`
-	AllowUpdateAvatar      bool   `form:"allow_update_avatar" json:"allow_update_avatar"`
-	AllowUpdateBio         bool   `form:"allow_update_bio" json:"allow_update_bio"`
-	AllowUpdateWebsite     bool   `form:"allow_update_website" json:"allow_update_website"`
-	AllowUpdateLocation    bool   `form:"allow_update_location" json:"allow_update_location"`
+	DefaultAvatar          string `validate:"required,oneof=system gravatar" json:"default_avatar"`
+	GravatarBaseURL        string `json:"gravatar_base_url"`
+	AllowUpdateDisplayName bool   `json:"allow_update_display_name"`
+	AllowUpdateUsername    bool   `json:"allow_update_username"`
+	AllowUpdateAvatar      bool   `json:"allow_update_avatar"`
+	AllowUpdateBio         bool   `json:"allow_update_bio"`
+	AllowUpdateWebsite     bool   `json:"allow_update_website"`
+	AllowUpdateLocation    bool   `json:"allow_update_location"`
 }
 
 // SiteLoginReq site login request
diff --git a/internal/service/siteinfo/siteinfo_service.go b/internal/service/siteinfo/siteinfo_service.go
index 986beb78..6edefd55 100644
--- a/internal/service/siteinfo/siteinfo_service.go
+++ b/internal/service/siteinfo/siteinfo_service.go
@@ -39,6 +39,7 @@ func NewSiteInfoService(
 	usersSiteInfo, _ := siteInfoCommonService.GetSiteUsers(context.Background())
 	if usersSiteInfo != nil {
 		constant.DefaultAvatar = usersSiteInfo.DefaultAvatar
+		constant.DefaultGravatarBaseURL = usersSiteInfo.GravatarBaseURL
 	}
 	generalSiteInfo, _ := siteInfoCommonService.GetSiteGeneral(context.Background())
 	if generalSiteInfo != nil {
@@ -229,6 +230,7 @@ func (s *SiteInfoService) SaveSiteUsers(ctx context.Context, req *schema.SiteUse
 	err = s.siteInfoRepo.SaveByType(ctx, constant.SiteTypeUsers, data)
 	if err == nil {
 		constant.DefaultAvatar = req.DefaultAvatar
+		constant.DefaultGravatarBaseURL = req.GravatarBaseURL
 	}
 	return err
 }
diff --git a/pkg/gravatar/gravatar.go b/pkg/gravatar/gravatar.go
index 6166af5e..92afcdd9 100644
--- a/pkg/gravatar/gravatar.go
+++ b/pkg/gravatar/gravatar.go
@@ -5,17 +5,15 @@ import (
 	"encoding/hex"
 	"fmt"
 	"net/url"
-)
 
-const (
-	defaultURLPrefix = "https://www.gravatar.com/avatar/"
+	"github.com/answerdev/answer/internal/base/constant"
 )
 
 // GetAvatarURL get avatar url from gravatar by email
 func GetAvatarURL(email string) string {
 	h := md5.New()
 	h.Write([]byte(email))
-	return defaultURLPrefix + hex.EncodeToString(h.Sum(nil))
+	return constant.DefaultGravatarBaseURL + hex.EncodeToString(h.Sum(nil))
 }
 
 // Resize resize avatar by pixel