Dear Sir, How we can get visa for 10 years old Son.

Dear Sir,

We are doing business with china market. We are importing goods from china & have been visit china.
Now i want to bring my son with me. He is only 10 years old only. So please guide us how to get visa( travel visa) for him. Because Chinese government can't issue invitation letter for young guy.

Looking to hear from your side.
Regards

M. Asif