multiple entry for Saudi family

I am a Saudi business woman, is there any way I can get 12 month multiple visa for China for me and my family. If so, what type should I apply for. My travel agent tells me only to apply for single entry type, and doesn't sugguest applying for multiple entry because they might reject it and I will lose my money. No one in my family has ever been rejected for a single entry type. Please your help is much needed.
Thanks in advance