hi I have 2 associates from UK have to apply China visa from India,how is the procedure

They may just walk in the visa office of the local China embassy or consulate with all the necessary documents during the working hours to submit the visa application in person or entrust a travel agency or visa agent to do it on their behalf. Since they are aliens in India, they should provide their valid Indian visa or residence permit and China visa application form V2011B as the supportive documents for their China visa application.