Hi, some of my clients from US wanted to apply one year chinese visa, what shall we do?

It is possible to get one year multiple entry Chinese visa now, but they should provide their previous Chinese visas for application. As I know, Chinese embassy only issue one year multiple visa to those who were issued at least 2 Chinese visas before within past 2 years. I am not sure if you are a travel agency or else, and the purpose of their visit, if visit for tourism, travel itinerary showing needs of multiple entries is required including flight ticket and hotel reservation.