diff --git a/Update.json b/Update.json
index 1c7bd178..fede9840 100644
--- a/Update.json
+++ b/Update.json
@@ -3288,6 +3288,17 @@
                 }
             ],
             "Notes": "No release notes were provided for this release."
+        },
+        "2.7.3": {
+            "UpdateDate": 1770436447016,
+            "Prerelease": true,
+            "UpdateContents": [
+                {
+                    "PR": 901,
+                    "Description": "Add isSubmitting flags to prevent multiple submissions"
+                }
+            ],
+            "Notes": "No release notes were provided for this release."
         }
     }
 }
\ No newline at end of file
diff --git a/XMOJ.user.js b/XMOJ.user.js
index 035aa0e0..002c5a83 100644
--- a/XMOJ.user.js
+++ b/XMOJ.user.js
@@ -1,6 +1,6 @@
 // ==UserScript==
 // @name         XMOJ
-// @version      2.7.2
+// @version      2.7.3
 // @description  XMOJ增强脚本
 // @author       @XMOJ-Script-dev, @langningchen and the community
 // @namespace    https://github/langningchen
@@ -2667,11 +2667,17 @@ async function main() {
                                 ErrorMessage.innerText = "提交失败！请关闭脚本后重试！";
                                 Submit.disabled = false;
                                 Submit.value = "提交";
+                                isSubmitting = false;
                             }
                         })
                     });
 
+                    let isSubmitting = false;
                     Submit.addEventListener("click", async () => {
+                        if (isSubmitting) {
+                            return;
+                        }
+                        isSubmitting = true;
                         PassCheck.style.display = "none";
                         ErrorElement.style.display = "none";
                         document.querySelector("#Submit").disabled = true;
@@ -2721,6 +2727,7 @@ async function main() {
                                 freopenCodeField.setSize("100%", "auto");
                                 document.querySelector("#Submit").disabled = false;
                                 document.querySelector("#Submit").value = "提交";
+                                isSubmitting = false;
                                 return false;
                             } else if (RegExp("//.*freopen").test(Source)) {
                                 PassCheck.style.display = "";
@@ -2729,6 +2736,7 @@ async function main() {
                                 ErrorMessage.innerText = "请不要注释freopen语句";
                                 document.querySelector("#Submit").disabled = false;
                                 document.querySelector("#Submit").value = "提交";
+                                isSubmitting = false;
                                 return false;
                             }
                         }
@@ -2739,6 +2747,7 @@ async function main() {
                             ErrorMessage.innerText = "源代码为空";
                             document.querySelector("#Submit").disabled = false;
                             document.querySelector("#Submit").value = "提交";
+                            isSubmitting = false;
                             return false;
                         }
                         if (UtilityEnabled("CompileError")) {
@@ -2761,6 +2770,7 @@ async function main() {
                                 ErrorMessage.innerText = "编译错误：\n" + Response.stderr.trim();
                                 document.querySelector("#Submit").disabled = false;
                                 document.querySelector("#Submit").value = "提交";
+                                isSubmitting = false;
                                 return false;
                             } else {
                                 PassCheck.click();
@@ -4378,22 +4388,30 @@ int main()
                                     }
                                 }
                             });
+                            let isSubmittingPost = false;
                             SubmitElement.addEventListener("click", async () => {
+                                if (isSubmittingPost) {
+                                    return;
+                                }
+                                isSubmittingPost = true;
                                 ErrorElement.style.display = "none";
                                 let Title = TitleElement.value;
                                 let Content = ContentElement.value;
                                 let ProblemID = parseInt(SearchParams.get("pid"));
                                 if (Title === "") {
                                     TitleElement.classList.add("is-invalid");
+                                    isSubmittingPost = false;
                                     return;
                                 }
                                 if (Content === "") {
                                     ContentElement.classList.add("is-invalid");
+                                    isSubmittingPost = false;
                                     return;
                                 }
                                 if (document.querySelector("#Board input:checked") === null) {
                                     ErrorElement.innerText = "请选择要发布的板块";
                                     ErrorElement.style.display = "block";
+                                    isSubmittingPost = false;
                                     return;
                                 }
                                 SubmitElement.disabled = true;
@@ -4407,6 +4425,7 @@ int main()
                                 }, (ResponseData) => {
                                     SubmitElement.disabled = false;
                                     SubmitElement.children[0].style.display = "none";
+                                    isSubmittingPost = false;
                                     if (ResponseData.Success == true) {
                                         location.href = "https://www.xmoj.tech/discuss3/thread.php?tid=" + ResponseData.Data.PostID;
                                     } else {
@@ -4897,7 +4916,12 @@ int main()
                                         }
                                     });
                                 });
+                                let isSubmittingReply = false;
                                 SubmitElement.addEventListener("click", async () => {
+                                    if (isSubmittingReply) {
+                                        return;
+                                    }
+                                    isSubmittingReply = true;
                                     ErrorElement.style.display = "none";
                                     SubmitElement.disabled = true;
                                     SubmitElement.children[0].style.display = "inline-block";
@@ -4908,6 +4932,7 @@ int main()
                                     }, async (ResponseData) => {
                                         SubmitElement.disabled = false;
                                         SubmitElement.children[0].style.display = "none";
+                                        isSubmittingReply = false;
                                         if (ResponseData.Success == true) {
                                             RefreshReply();
                                             ContentElement.value = "";
@@ -4944,4 +4969,4 @@ int main()
 
 main().then(r => {
     console.log("XMOJ-Script loaded successfully!");
-});
\ No newline at end of file
+});
diff --git a/package.json b/package.json
index d558b7ac..3c315c9f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "xmoj-script",
-  "version": "2.7.2",
+  "version": "2.7.3",
   "description": "an improvement script for xmoj.tech",
   "main": "AddonScript.js",
   "scripts": {