dear sir or madam : i m a pakistani passport holder and having resident visa in france. How can I apply for a China visa?

If you have family in China, you can apply for a family visit visa (L) to China. You can submit your application to CVASV in Paris, or Chinese consulate over your area of residence. Check their consular districts first from https://www.travelchinaguide.com/embassy/france.htm and for detailed requirements as well.