diff --git a/.workbuddy/expert-history.json b/.workbuddy/expert-history.json
index 6ed51ad..81ad213 100644
--- a/.workbuddy/expert-history.json
+++ b/.workbuddy/expert-history.json
@@ -13,5 +13,5 @@
       }
     ]
   },
-  "lastUpdated": 1776159168693
+  "lastUpdated": 1776160119257
 }
\ No newline at end of file
diff --git a/frontend/ops_vue_js/src/i18n/en.json b/frontend/ops_vue_js/src/i18n/en.json
index b27fe02..e7e1ada 100644
--- a/frontend/ops_vue_js/src/i18n/en.json
+++ b/frontend/ops_vue_js/src/i18n/en.json
@@ -133,6 +133,7 @@
     "fee_type": "Fee type",
     "input_quantity": "Quantity",
     "input_fee": "Fee",
+    "fee_hint": "Decimal point must be \".\", input method may prevent typing",
     "select_currency": "Select currency",
     "add": "Add",
     "add_cost": "Add Cost",
diff --git a/frontend/ops_vue_js/src/i18n/zh-CN.json b/frontend/ops_vue_js/src/i18n/zh-CN.json
index 7702ac9..356099f 100644
--- a/frontend/ops_vue_js/src/i18n/zh-CN.json
+++ b/frontend/ops_vue_js/src/i18n/zh-CN.json
@@ -133,6 +133,7 @@
     "fee_type": "费用类型",
     "input_quantity": "数量",
     "input_fee": "费用",
+    "fee_hint": "小数点必须是 \".\"，开启输入法状态可能无法输入",
     "select_currency": "选择货币类型",
     "add": "添加",
     "add_cost": "添加费用",
diff --git a/frontend/ops_vue_js/src/views/purchase/addorder.vue b/frontend/ops_vue_js/src/views/purchase/addorder.vue
index 378f0b1..5129b77 100644
--- a/frontend/ops_vue_js/src/views/purchase/addorder.vue
+++ b/frontend/ops_vue_js/src/views/purchase/addorder.vue
@@ -472,9 +472,17 @@ async function handleSubmit() {
 
             <!-- 单价输入 -->
             <div>
-              <label class="mb-1 block text-xs font-medium text-gray-500">{{
-                t("purchase_addorder.input_fee")
-              }}</label>
+              <label class="mb-1 flex items-center gap-1 block text-xs font-medium text-gray-500">
+                {{ t("purchase_addorder.input_fee") }}
+                <span class="relative group">
+                  <svg class="h-3.5 w-3.5 text-gray-400 cursor-help" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
+                  </svg>
+                  <span class="absolute bottom-full left-1/2 -translate-x-1/2 mb-1 hidden group-hover:block w-48 p-2 text-xs text-white bg-gray-800 rounded-lg shadow-lg z-10 whitespace-normal">
+                    {{ t("purchase_addorder.fee_hint") }}
+                  </span>
+                </span>
+              </label>
               <input
                 v-model="newCost.cost"
                 type="number"
diff --git a/frontend/ops_vue_js/src/views/purchase/editorder.vue b/frontend/ops_vue_js/src/views/purchase/editorder.vue
index 3588954..d727c5f 100644
--- a/frontend/ops_vue_js/src/views/purchase/editorder.vue
+++ b/frontend/ops_vue_js/src/views/purchase/editorder.vue
@@ -478,9 +478,17 @@ async function handleSubmit() {
               />
             </div>
             <div>
-              <label class="mb-1 block text-xs font-medium text-gray-500">{{
-                t("purchase_addorder.input_fee")
-              }}</label>
+              <label class="mb-1 flex items-center gap-1 block text-xs font-medium text-gray-500">
+                {{ t("purchase_addorder.input_fee") }}
+                <span class="relative group">
+                  <svg class="h-3.5 w-3.5 text-gray-400 cursor-help" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
+                  </svg>
+                  <span class="absolute bottom-full left-1/2 -translate-x-1/2 mb-1 hidden group-hover:block w-48 p-2 text-xs text-white bg-gray-800 rounded-lg shadow-lg z-10 whitespace-normal">
+                    {{ t("purchase_addorder.fee_hint") }}
+                  </span>
+                </span>
+              </label>
               <input
                 v-model="newCost.cost"
                 type="number"