diff --git a/src/views/contract/launch/components/mixedSignModal.vue b/src/views/contract/launch/components/mixedSignModal.vue
index 19bca5f..a06d61e 100644
--- a/src/views/contract/launch/components/mixedSignModal.vue
+++ b/src/views/contract/launch/components/mixedSignModal.vue
@@ -15,6 +15,9 @@
     wrap-class-name="seal-full-modal"
   >
     <div class="sign-platform" @click="hideCtxMenu">
+      <div v-if="modalLoading" class="platform-loading-mask">
+        <a-spin size="large" />
+      </div>
       <div v-if="!contractId" class="platform-layout platform-layout-empty">
         <div class="preview-area empty-preview">
           <div class="preview-placeholder">
@@ -688,6 +691,7 @@ function getResponseMessage(res, fallback = "操作失败") {
 }
 
 const visible = ref(false);
+const modalLoading = ref(false);
 const businessRecord = ref(null);
 const emit = defineEmits(["business-updated"]);
 const completeSignDate = ref("");
@@ -1018,6 +1022,7 @@ function resetModalState(record = null) {
 }
 
 async function showModal(contractIdParam, businessRecordParam) {
+  modalLoading.value = true;
   let contractIdToLoad = "";
   let contextRecord = null;
 
@@ -1040,6 +1045,7 @@ async function showModal(contractIdParam, businessRecordParam) {
     await loadContract(contractIdToLoad);
     await nextTick();
     calcDisplaySize();
+    modalLoading.value = false;
     return;
   }
 
@@ -1060,6 +1066,7 @@ async function showModal(contractIdParam, businessRecordParam) {
       }
     } catch {}
   }
+  modalLoading.value = false;
 }
 
 defineExpose({ showModal });
@@ -1866,6 +1873,17 @@ watch(visible, (value) => {
   overflow: hidden;
   display: flex;
   flex-direction: column;
+  position: relative;
+}
+
+.platform-loading-mask {
+  position: absolute;
+  inset: 0;
+  z-index: 999;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(255, 255, 255, 0.7);
 }
 
 .platform-layout {