diff --git a/packages/vant/src/area/Area.tsx b/packages/vant/src/area/Area.tsx
index 2f7b2af62..b90622547 100644
--- a/packages/vant/src/area/Area.tsx
+++ b/packages/vant/src/area/Area.tsx
@@ -66,15 +66,19 @@ export default defineComponent({
     watch(
       () => props.modelValue,
       (newCode) => {
-        const lastCode = codes.value.length
-          ? codes.value[codes.value.length - 1]
-          : '';
-        if (newCode && newCode !== lastCode) {
-          codes.value = [
-            `${newCode.slice(0, 2)}0000`,
-            `${newCode.slice(0, 4)}00`,
-            newCode,
-          ].slice(0, +props.columnsNum);
+        if (newCode) {
+          const lastCode = codes.value.length
+            ? codes.value[codes.value.length - 1]
+            : '';
+          if (newCode !== lastCode) {
+            codes.value = [
+              `${newCode.slice(0, 2)}0000`,
+              `${newCode.slice(0, 4)}00`,
+              newCode,
+            ].slice(0, +props.columnsNum);
+          }
+        } else {
+          codes.value = [];
         }
       },
       { immediate: true }
diff --git a/packages/vant/src/area/utils.ts b/packages/vant/src/area/utils.ts
index 0af32ccea..258d87c95 100644
--- a/packages/vant/src/area/utils.ts
+++ b/packages/vant/src/area/utils.ts
@@ -38,9 +38,9 @@ export function formatDataForCascade({
   columnsPlaceholder: placeholder,
 }: AreaProps) {
   const {
-    city_list: city,
-    county_list: county,
-    province_list: province,
+    city_list: city = {},
+    county_list: county = {},
+    province_list: province = {},
   } = areaList;
   const showCity = columnsNum > 1;
   const showCounty = columnsNum > 2;