Chinese government already formally approved the program of building up Chinese Space Station (CSS) in 2010. As the key task for CSS program, the planning for scientific utilization of CSS started even earlier. Working with scientists in different fields for more than three years, the science plan in these fields has been preliminary established. In microgravity sciences, there are 3 fields of researches planned, including the fluid physics and combustion, material science in space and the fundamental physics in microgravity. The corresponding research facilities and devices are also planned to meet the science research demands. CSS will serve on orbit for almost 10 years, and the utilization planning for CSS is a long-term and sustained work. The utilization plan will be updated and extended in the further, and make CSS an outstanding solution for space utilization of larger scale.