diff --git a/video-gen-api/app/api/v1/invoices.py b/video-gen-api/app/api/v1/invoices.py
index 2516f218..1c5ad882 100644
--- a/video-gen-api/app/api/v1/invoices.py
+++ b/video-gen-api/app/api/v1/invoices.py
@@ -79,29 +79,29 @@ def _invoice_to_out(invoice: Invoice, orders: list[InvoiceOrder]) -> dict:
     """将 Invoice ORM 对象转换为响应 dict。"""
     return {
         "id": invoice.id,
-        "userId": invoice.user_id,
-        "invoiceNo": invoice.invoice_no,
-        "headerType": invoice.header_type,
-        "headerName": invoice.header_name,
-        "headerTaxNo": invoice.header_tax_no,
-        "headerRegisterAddress": invoice.header_register_address,
-        "headerRegisterPhone": invoice.header_register_phone,
-        "headerBankName": invoice.header_bank_name,
-        "headerBankAccount": invoice.header_bank_account,
+        "user_id": invoice.user_id,
+        "invoice_no": invoice.invoice_no,
+        "header_type": invoice.header_type,
+        "header_name": invoice.header_name,
+        "header_tax_no": invoice.header_tax_no,
+        "header_register_address": invoice.header_register_address,
+        "header_register_phone": invoice.header_register_phone,
+        "header_bank_name": invoice.header_bank_name,
+        "header_bank_account": invoice.header_bank_account,
         "email": invoice.email,
-        "totalAmount": round(float(invoice.total_amount), 2),
-        "totalCredits": round(float(invoice.total_credits), 2),
+        "total_amount": round(float(invoice.total_amount), 2),
+        "total_credits": round(float(invoice.total_credits), 2),
         "status": invoice.status,
-        "failureReason": invoice.failure_reason,
-        "issuedAt": invoice.issued_at.isoformat() if invoice.issued_at else None,
-        "createdAt": invoice.created_at.isoformat() if invoice.created_at else None,
-        "updatedAt": invoice.updated_at.isoformat() if invoice.updated_at else None,
+        "failure_reason": invoice.failure_reason,
+        "issued_at": invoice.issued_at.isoformat() if invoice.issued_at else None,
+        "created_at": invoice.created_at.isoformat() if invoice.created_at else None,
+        "updated_at": invoice.updated_at.isoformat() if invoice.updated_at else None,
         "orders": [
             {
                 "id": o.id,
-                "invoiceId": o.invoice_id,
-                "orderId": o.order_id,
-                "orderNo": o.order_no,
+                "invoice_id": o.invoice_id,
+                "order_id": o.order_id,
+                "order_no": o.order_no,
                 "amount": round(float(o.amount), 2),
                 "credits": round(float(o.credits), 2),
             }