I am a Sri Lankan National My Fiancee is Indian National and he is holding 2 years residence Visa, how can I get a visa to China?

My Fiancee is Indian National and he is holding 2 years Residence Visa to China. He is having business activities with China
Could you please explain to me in which way he can sponsor me to visit China ? My Fiancee would like me to Visit China as he is residing in China. How can I appy for a Visit Visa to entry into China ? What are the documents that I have to submit to the Consular Office to get a Visit Visa to China ? What supporting documents are my Fiancee required to give me for applying for Visit Visa to China ? How many days it will take ? I would be very grateful, if you could kindly reply me for same.