diff --git a/src/pages/Proof/Reply_Public/ProofForm.js b/src/pages/Proof/Reply_Public/ProofForm.js
index cfa395a..764b4a2 100644
--- a/src/pages/Proof/Reply_Public/ProofForm.js
+++ b/src/pages/Proof/Reply_Public/ProofForm.js
@@ -7,6 +7,7 @@ import {
     TextField,
     FormLabel,
     Button,
+    CircularProgress,
     Checkbox,
     RadioGroup, Radio,
     FormControlLabel
@@ -51,6 +52,7 @@ const FormPanel = ({ formData }) => {
     const [warningTitle, setWarningTitle] = React.useState("");
     const [isWarningPopUp, setIsWarningPopUp] = React.useState(false);
     const [warningText, setWarningText] = React.useState("");
+    const [isSubmitting, setIsSubmitting] = React.useState(false);
     const [isOnlyOnlinePayment, setOnlyOnlinePayment] = React.useState();
     const [isNoPayment, setNoPayment] = React.useState();
     
@@ -87,6 +89,7 @@ const FormPanel = ({ formData }) => {
             vaild: yup.string().max(255, intl.formatMessage({ id: 'requireLoginPassword' })).required(intl.formatMessage({ id: 'requireLoginPassword' })),
         }),
         onSubmit: values => {
+            if (isSubmitting) return;
             if (isOverTime() && !isDummyLoggedIn()) {
                 setWarningTitle(intl.formatMessage({ id: "attention" }))
                 setWarningText(intl.formatMessage({ id: 'MSG.proofOutOfTime' }));
@@ -124,6 +127,7 @@ const FormPanel = ({ formData }) => {
                 }
             }
             // console.log(values);
+            setIsSubmitting(true);
             HttpUtils.postWithFiles({
                 url: UrlUtils.REPLY_PROOF,
                 params: {
@@ -134,8 +138,15 @@ const FormPanel = ({ formData }) => {
                 },
                 files: attachments ? attachments : [],
                 onSuccess: function (responseData) {
+                    setIsSubmitting(false);
                     // console.log(responseData)
                     if (responseData.success === false) {
+                        if (responseData.msg) {
+                            setWarningTitle(intl.formatMessage({ id: "attention" }))
+                            setWarningText(intl.formatMessage({ id: responseData.msg }));
+                            setIsWarningPopUp(true);
+                            return;
+                        }
                         navigate("/publicNotice/" + responseData.id);
                     } else {
                         if (responseData.msg) {
@@ -153,12 +164,14 @@ const FormPanel = ({ formData }) => {
                     }
                 },
                 onFail: function (response) {
+                    setIsSubmitting(false);
                     setWarningTitle(intl.formatMessage({ id: "attention" }))
                     setWarningText(intl.formatMessage({ id: 'actionFail' }));
                     setIsWarningPopUp(true);
                     console.log(response);
                 },
                 onError: function (error) {
+                    setIsSubmitting(false);
                     setWarningTitle(intl.formatMessage({ id: "attention" }))
                     setWarningText(intl.formatMessage({ id: 'actionFail' }));
                     setIsWarningPopUp(true);
@@ -689,7 +702,8 @@ const FormPanel = ({ formData }) => {
                                                 variant="contained"
                                                 color="success"
                                                 type="submit"
-                                                disabled={actionValue == false && isOverReviseDeadline()}
+                                                disabled={(actionValue == false && isOverReviseDeadline()) || isSubmitting}
+                                                startIcon={isSubmitting ? <CircularProgress size={20} color="inherit" /> : null}
                                                 aria-label={intl.formatMessage({ id: 'submitReply' })}
                                             >
                                                 <FormattedMessage id="submitReply" />
diff --git a/src/translations/en.json b/src/translations/en.json
index 0f41b37..e106d0a 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -84,6 +84,7 @@
   "MSG.payMsg3": "If you have multiple Public Notice applications within the Year {issueYear},  Volume {issueVolume}, Issue {issueNo} of the Gazette, you can choose to combine the payments for all the approved manuscripts within this issue in 'My Public Notice' before the payment deadline.",
 
   "MSG.proofOutOfTime": "Proofing timed out.  Please apply again.",
+  "MSG.proofAlreadyReplied": "This proof has already been replied to. Please refresh the page.",
   "MSG.overReviseDeadline": "Deadline for online manuscript revision is over. Please apply again as necessary.",
   "MSG.plzSelectPaymentMethod": "Please select payment methods",
   "MSG.plzSelectApp": "Please select application",
diff --git a/src/translations/zh-CN.json b/src/translations/zh-CN.json
index 260d437..019667f 100644
--- a/src/translations/zh-CN.json
+++ b/src/translations/zh-CN.json
@@ -120,6 +120,7 @@
   "MSG.payMsg3": "如你在宪报期数{issueYear} 年{issueVolume} 卷, 第{issueNo} 期内有多于一个公共启事的申请，你可选择完成此期所有稿件校对确定后，于缴费限期前在「我的公共启事」内合并付款。",
 
   "MSG.proofOutOfTime": "回复逾时，请重新申请。",
+  "MSG.proofAlreadyReplied": "此校对已回复，请刷新页面。",
   "MSG.overReviseDeadline": "网上俢订稿件最后限期已过，请按情况重新申请。",
   "MSG.plzSelectPaymentMethod": "请选择付款方式",
   "MSG.plzSelectApp": "请选择公共启事。",
diff --git a/src/translations/zh-HK.json b/src/translations/zh-HK.json
index 48fdc35..059baa3 100644
--- a/src/translations/zh-HK.json
+++ b/src/translations/zh-HK.json
@@ -120,6 +120,7 @@
   "MSG.payMsg3": "如你在憲報期數 {issueYear} 年 {issueVolume} 卷, 第 {issueNo} 期內有多於一個公共啟事的申請，你可選擇完成此期所有稿件校對確定後，於繳費限期前在「我的公共啟事」內合併付款。",
 
   "MSG.proofOutOfTime": "回覆逾時，請重新申請。",
+  "MSG.proofAlreadyReplied": "此校對已回覆，請重新整理頁面。",
   "MSG.overReviseDeadline": "網上俢訂稿件最後限期已過，請按情況重新申請。",
   "MSG.plzSelectApp": "請選擇公共啟事。",
   "MSG.plzSelectPaymentMethod": "請選擇付款方式",