diff --git a/AMESCoreStudio.Web/Controllers/WHSController.cs b/AMESCoreStudio.Web/Controllers/WHSController.cs
index 69a920e..ba74b9d 100644
--- a/AMESCoreStudio.Web/Controllers/WHSController.cs
+++ b/AMESCoreStudio.Web/Controllers/WHSController.cs
@@ -3516,6 +3516,11 @@ namespace AMESCoreStudio.Web.Controllers
                     ModelState.AddModelError("error", "請至少選擇一個線別");
                     return View("WHS025C", model);
                 }
+                if (model.Ct <= 0)
+                {
+                    ModelState.AddModelError("error", "CT不可小於0");
+                    return View("WHS025C", model);
+                }
                 // 複製 model 中的其他欄位，產生新的物件
                 var item = new WorkingStandardWorkTime
                 {
@@ -3563,6 +3568,11 @@ namespace AMESCoreStudio.Web.Controllers
             if (ModelState.IsValid)
             {
                 IResultModel result;
+                if (model.Ct <= 0)
+                {
+                    ModelState.AddModelError("error", "CT不可小於0");
+                    return View("WHS025U", model);
+                }
 
                 result = await _whsApi.PutWorkingStandardWorkTime(model.WorkingStandardID, JsonConvert.SerializeObject(model));
 
@@ -3826,9 +3836,10 @@ namespace AMESCoreStudio.Web.Controllers
                                 ErrorMsg += $"{rowMsg}人數必須大於 0\n"; continue;
                             }
 
-                            if (!int.TryParse(CtStr, out int Ct))
+                            if (!decimal.TryParse(CtStr, out decimal Ct))
                             {
-                                ErrorMsg += $"{rowMsg}CT格式錯誤\n"; continue;
+                                ErrorMsg += $"{rowMsg}CT 格式錯誤\n";
+                                continue;
                             }
                             if (Ct <= 0)
                             {
diff --git a/AMESCoreStudio.Web/ViewModels/WHS/WHS025ViewModel.cs b/AMESCoreStudio.Web/ViewModels/WHS/WHS025ViewModel.cs
index f35107d..4f2f7ad 100644
--- a/AMESCoreStudio.Web/ViewModels/WHS/WHS025ViewModel.cs
+++ b/AMESCoreStudio.Web/ViewModels/WHS/WHS025ViewModel.cs
@@ -42,8 +42,9 @@ namespace AMESCoreStudio.Web.ViewModels.WHS
         public int OpCnt { get; set; }
       
         [Required(ErrorMessage = "{0},不能空白")]
+        [Range(0.00001, double.MaxValue, ErrorMessage = "{0},必須大於0")]
         [Display(Name = "標準工時(分)")]
-        public int Ct { get; set; }
+        public decimal Ct { get; set; }
 
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "作業機台數")]
diff --git a/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTime.cs b/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTime.cs
index 2665377..7ccf505 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTime.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTime.cs
@@ -86,8 +86,9 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         /// </summary>
         [Column("CT")]
         [DataMember]
+        [Range(0.00001, double.MaxValue, ErrorMessage = "{0},必須大於0")]
         [Display(Name = "標準工時(分)")]
-        public int Ct { get; set; } = 0;
+        public decimal Ct { get; set; } = 0;
 
 
         /// <summary>
diff --git a/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTimeLog.cs b/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTimeLog.cs
index a539e1d..82ffbde 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTimeLog.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/WorkingStandardWorkTimeLog.cs
@@ -95,7 +95,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("CT")]
         [DataMember]
         [Display(Name = "標準工時(分)")]
-        public int Ct { get; set; } = 0;
+        public decimal Ct { get; set; } = 0;
 
         /// <summary>
         /// 作業機台數