diff --git a/src/SecurityTokenService/Controllers/AccountController.cs b/src/SecurityTokenService/Controllers/AccountController.cs
index 384f504..d333f40 100644
--- a/src/SecurityTokenService/Controllers/AccountController.cs
+++ b/src/SecurityTokenService/Controllers/AccountController.cs
@@ -195,6 +195,13 @@ public async Task<IActionResult> Login([FromBody] Inputs.V1.LoginInput model)
 
         if (!PasswordLoginTwoFactorEnable)
         {
+            if (model.CaptchaCode.IsNullOrEmpty())
+            {
+                return new ObjectResult(new ApiResult
+                {
+                    Code = Errors.IdentityInvalidCredentials, Success = false, Message = "请输入验证码"
+                });
+            }
             var checkCaptchaResult = Util.CheckCaptcha(memoryCache, logger, Request, model.CaptchaCode);
             if (checkCaptchaResult != null)
             {
diff --git a/src/SecurityTokenService/Controllers/Inputs.cs b/src/SecurityTokenService/Controllers/Inputs.cs
index b8f2b0a..6da211e 100644
--- a/src/SecurityTokenService/Controllers/Inputs.cs
+++ b/src/SecurityTokenService/Controllers/Inputs.cs
@@ -197,7 +197,7 @@ public class LoginInput
             /// <summary>
             /// 
             /// </summary>
-            [StringLength(10, ErrorMessage = "验证码长度超长"), Required(ErrorMessage = "请输入验证码")]
+            [StringLength(10, ErrorMessage = "验证码长度超长")]
             public string CaptchaCode { get; set; }
             
             /// <summary>