diff --git a/src/views/trials/trials-workbench/components/needSignSysDoc.vue b/src/views/trials/trials-workbench/components/needSignSysDoc.vue
index f34f4973..ce8a7d16 100644
--- a/src/views/trials/trials-workbench/components/needSignSysDoc.vue
+++ b/src/views/trials/trials-workbench/components/needSignSysDoc.vue
@@ -77,7 +77,7 @@
             icon="el-icon-edit-outline"
             circle
             v-if="!isSigned"
-            :disabled="IsFirstSysDocNeedSign && !~scope.row.DocTypeCode"
+            :disabled="IsFirstSysDocNeedSign && !!~scope.row.DocTypeCode"
             :title="$t('trials:needSignSysDoc:action:sign')"
             @click="handleSign(scope.row)"
           />