VISITING MY SPOUSE

My husband is currently working in China and I would like to go stay with him for less than 6 months. I have a copy of his application for work visa, I have a letter from his employer verifying his employment, I have our marriage certificate, I have my one way flight to China and round trip from China to Hong Kong; however, I do not have my flight back yet. What are other special requirements for me to get approved for a 6 month multiple-entry visa besides what I count with?