Here is the visa application form of the People's Republic of China.
Here is the supplementary visa application form of the People's Republic of China.
Original passport with at least six months of remaining validity and blank visa pages, and a photocopy of the passport's data page and the photo page if it is separate.
Foreigners intending to enter China shall apply for a visa, except the situations where there exists a visa exemption agreement or China grants a visa exemption.
In accordance with the legal provisions, foreigners may change visa in following four circumstances...
Issued to those who intend to go to China for commercial and trade activities.
Issued to those who are family members of Chinese citizens or of foreigners with Chinese permanent residence and intend to go to China for family reunion, or to those who intend to go to China for the purpose of foster care. The intended duration of stay in China exceeds 180 days.
Issued to those who intend to visit their relatives who are Chinese citizens residing in China or foreigners with permanent residence in China. The intended duration of stay in China is no more than 180 days.