diff --git a/src/views/mold/inspectionPlan/InspectionPlanForm.vue b/src/views/mold/inspectionPlan/InspectionPlanForm.vue
index 1daef361..162bb349 100644
--- a/src/views/mold/inspectionPlan/InspectionPlanForm.vue
+++ b/src/views/mold/inspectionPlan/InspectionPlanForm.vue
@@ -277,7 +277,7 @@ const submitForm = async () => {
       planName: formData.value.planName,
       planType: formData.value.planType,
       description: formData.value.description,
-      subjectIdS: formData.value.subjectIds?.length ? formData.value.subjectIds.join(',') : undefined
+      subjectIdS: formData.value.subjectIds ? String(formData.value.subjectIds) : undefined
     }
     if (formType.value === 'create') {
       await PlanMaintenanceApi.createPlanMaintenance(data)