diff --git a/internal/handler/handler.go b/internal/handler/handler.go
index 82d5411..a426b5d 100644
--- a/internal/handler/handler.go
+++ b/internal/handler/handler.go
@@ -103,7 +103,7 @@ func (s *Server) Login(c *gin.Context) {
 func (s *Server) Health(c *gin.Context) {
 	var totalKeys, healthyKeys int64
 	s.DB.Model(&models.APIKey{}).Count(&totalKeys)
-	s.DB.Model(&models.APIKey{}).Where("status = ?", "active").Count(&healthyKeys)
+	s.DB.Model(&models.APIKey{}).Where("status = ?", models.KeyStatusActive).Count(&healthyKeys)
 
 	status := "healthy"
 	httpStatus := http.StatusOK
diff --git a/internal/handler/key_handler.go b/internal/handler/key_handler.go
index 1668d99..75c0a24 100644
--- a/internal/handler/key_handler.go
+++ b/internal/handler/key_handler.go
@@ -108,7 +108,7 @@ func (s *Server) ListKeysInGroup(c *gin.Context) {
 	}
 
 	statusFilter := c.Query("status")
-	if statusFilter != "" && statusFilter != "active" && statusFilter != "inactive" {
+	if statusFilter != "" && statusFilter != models.KeyStatusActive && statusFilter != models.KeyStatusInvalid {
 		response.Error(c, app_errors.NewAPIError(app_errors.ErrValidation, "Invalid status filter"))
 		return
 	}
@@ -254,4 +254,3 @@ func (s *Server) ClearAllInvalidKeys(c *gin.Context) {
 
 	response.Success(c, gin.H{"message": fmt.Sprintf("%d invalid keys cleared.", rowsAffected)})
 }
-
diff --git a/internal/models/types.go b/internal/models/types.go
index 05d71c2..9cfea91 100644
--- a/internal/models/types.go
+++ b/internal/models/types.go
@@ -6,6 +6,12 @@ import (
 	"gorm.io/datatypes"
 )
 
+// Key状态
+const (
+	KeyStatusActive  = "active"
+	KeyStatusInvalid = "invalid"
+)
+
 // SystemSetting 对应 system_settings 表
 type SystemSetting struct {
 	ID           uint      `gorm:"primaryKey;autoIncrement" json:"id"`
diff --git a/internal/services/key_cron_service.go b/internal/services/key_cron_service.go
index 9ea2f4f..50e8c40 100644
--- a/internal/services/key_cron_service.go
+++ b/internal/services/key_cron_service.go
@@ -172,14 +172,14 @@ func (s *KeyCronService) processResults() {
 			var newErrorReason string
 
 			if result.Error != nil {
-				newStatus = "inactive"
+				newStatus = models.KeyStatusInvalid
 				newErrorReason = result.Error.Error()
 			} else {
 				if result.IsValid {
-					newStatus = "active"
+					newStatus = models.KeyStatusActive
 					newErrorReason = ""
 				} else {
-					newStatus = "inactive"
+					newStatus = models.KeyStatusInvalid
 					newErrorReason = "Validation returned false without a specific error."
 				}
 			}