He can obtain a work visa to China, the required documents are: 1. visa notification letter issued by the local Economic and Trade Bureau where the restaurant is located
2. Business License with the name of your husband
3. his passport, one passport photo, fill one visa application form

it takes months to prepare all requirements, after entering China by work visa, he needs to change it into 1 year residence permit for work, then he can stay in China for 1 year.