diff --git a/app/Controller/Recharge/RechargeController.php b/app/Controller/Recharge/RechargeController.php
index 22c64dc..009ecbd 100644
--- a/app/Controller/Recharge/RechargeController.php
+++ b/app/Controller/Recharge/RechargeController.php
@@ -37,6 +37,7 @@ class RechargeController extends AbstractController
                 'cardNo' => $user->card_no ?? '',
                 'mobile' => $user->mobile ?? '',
                 'bankCardNo' => $bankCard->bank_card_no ?? '',
+                'amount' => intval($prePayLog->amount / 100),
             ];
         }
         return $this->success([
@@ -51,15 +52,19 @@ class RechargeController extends AbstractController
             throw new BusinessException('请输入姓名');
         }
         $amount = $request->input('amount');
-        if (empty($amount)) {
-            throw new BusinessException('请输入金额');
-        }
-        if (!is_numeric($amount)) {
-            throw new BusinessException('请输入金额');
-        }
-        if ($amount <= 0) {
-            throw new BusinessException('金额需大于0');
+        if ($prePayLog->amount == 0) {
+            $amount = $request->input('amount');
+            if (empty($amount)) {
+                throw new BusinessException('请输入金额');
+            }
+            if (!is_numeric($amount)) {
+                throw new BusinessException('请输入金额');
+            }
+            if ($amount <= 0) {
+                throw new BusinessException('金额需大于0');
+            }
         }
+        
         $cardNo = $request->input('cardNo');
         if (empty($cardNo)) {
             throw new BusinessException('请输入身份证号');
@@ -86,7 +91,8 @@ class RechargeController extends AbstractController
         if ($bankCard) {
             $outOrderNo = $prePayLog->out_order_no;
             $nextStep = 'confirm-pay';
-            $bizData = $this->paymentService->protocolPayPreRequest($this->buildPrepayParams($prePayLog->out_member_id, $outOrderNo, $bankCard->protocol, intval($amount * 100), $app));
+            $amount = $prePayLog->amount > 0 ? $prePayLog->amount :  intval($amount * 100);
+            $bizData = $this->paymentService->protocolPayPreRequest($this->buildPrepayParams($prePayLog->out_member_id, $outOrderNo, $bankCard->protocol, $amount, $app));
         } else {
             $mchOrderNo = StringHelper::generateBankCardOrderNo();
             $nextStep = 'confirm-bind';
diff --git a/app/Service/PaymentService.php b/app/Service/PaymentService.php
index 2da558e..c108f48 100644
--- a/app/Service/PaymentService.php
+++ b/app/Service/PaymentService.php
@@ -340,6 +340,16 @@ class PaymentService extends AbstractService
         if (!$reqData['outMemberId']) {
             throw new BusinessException('用户ID不能为空');
         }
+
+        if (isset($reqData['amount']) {
+            if (!is_numeric($reqData['amount'])) {
+                throw new BusinessException('请输入金额');
+            }
+            if ($reqData['amount'] <= 100 || $reqData['amount'] > 300000) {
+                throw new BusinessException('充值金额必须为100~300000');
+            }
+        }
+
         if (!$reqData['notifyUrl']) {
             throw new BusinessException('通知地址不能为空');
         }
@@ -355,6 +365,7 @@ class PaymentService extends AbstractService
         $log = new PrePayLog();
         $log->app_id = $app->app_id;
         $log->out_order_no = $reqData['outOrderNo'];
+        $log->amount = $reqData['amount'] ?: 0;
         $log->out_member_id = $reqData['outMemberId'];
         $log->notify_url = $reqData['notifyUrl'];
         $log->redirect_url = $reqData['redirectUrl'] ?? '';
diff --git a/public/payment.html b/public/payment.html
index 338e0c3..4760894 100644
--- a/public/payment.html
+++ b/public/payment.html
@@ -27,7 +27,7 @@
                             <el-input v-model="form.bankCardNo"></el-input>
                         </el-form-item>
                         <el-form-item label="充值金额">
-                            <el-input-number v-model="form.amount" :min="1" :max="3000" label="充值金额"></el-input-number>
+                            <el-input-number v-model="form.amount" :min="1" :max="3000" label="充值金额" :readonly="amountReadonly"></el-input-number>
                         </el-form-item>
                         <el-form-item label="备注">
                           <el-input type="textarea" v-model="form.remark"></el-input>
@@ -98,7 +98,8 @@
                     bankCardNo: '',
                     amount: 1,
                     remark: ''
-                }
+                },
+                amountReadonly: false
             }
         },
         created() {
@@ -204,6 +205,10 @@
                         this.form.cardNo = result.user.cardNo;
                         this.form.mobile = result.user.mobile;
                         this.form.bankCardNo = result.user.bankCardNo;
+                        if (this.form.amount > 0) {
+                            this.form.amount = result.user.amount;
+                            this.amountReadonly = true;
+                        }
                     }
                 })
                 .catch((error) => {