I am engaged to a Chinese national and want to go to China to get married.

As you are not married, I think you can only apply for a tourist L type entry permit with your passport, a photocopy of the passport, a filled application form, recent photo, and invitation letter from your fiancee. After you arrive at China, the authenticated single status certificate is needed for registrating your marriage. In additon, you need to provide your passport, L type entry permit, and attested divorce certificate. The single status certificate and divorce certificate shoulf be translated by a certified translation company in China.