Does it affect the passport if the identity card of Laos married to China expires?

You can't. The ID card is only used to apply for a passport. In flight regulations, check-in, customs and entry and exit are all passports. Without an ID card, the passport will be affected if it expires. Therefore, the identity card of the Lao married to China has expired, which has no effect on the passport. Passport is a legal document issued by a country to prove the nationality and identity of its citizens when they enter and leave the country and travel or stay abroad.