Please take your single status certificate for getting married in China. As for the China visa, you can apply for X visa (student) or F visa (Business)

First thanks for you reply, i went to china for studies on X visa before when i was student and then after that i got F visa , but now i am going to get married so which visa i need now , i can get L type visa? or need to apply for F visa? I am still single, i need to go there fast , go can u tell me on which visa i go , thanks

You should apply for L visa,
You should submit:
(I) Original passport with validity more than six months and minimum 2 blank visa pages;
(II) Photocopy of the first 2 pages (personal information) of the passport and the recent Chinese visa page if there is any;
(II) One fully completed visa application form in Chinese or English, attached with one of the applicant's recent color photograph (30mm X 40mm)
(III) Certificate of the relationship between you and the person in China you want to visit (original and photocopy)
(IV) Invitation letter from your girlfriend you want to visit
(V) ID card copy or passport copy of your girlfriend