A kind of thermotropic intelligent solar shading material was prepared. The effect of different ratio of raw materials, temperature and time on the change of transmittance, and the water quality and anti mildew agent on its resistance to mildew was studied. Results show that by adjusting the ratio of raw materials can make its transmittance changes between 80% ~ 90%. Temperature is the main factor of the change of transmittance of intelligent solar shading material. Introduction of anti mildew agent and adjust pH value can protect intelligent solar shading material from mildewing in 3 ~ 5 years.