In order to make up for some shortcomings in typical phase change materials such as thermal conductivity and phase change temperature, this paper takes a new composite inorganic hydrated salt medium temperature phase change material (NKAP-01C type) as the heat storage material with new thermal oil medium temperature solar collector as the research object, by designing and building a research and test platform for the heat storage and discharge performance of phase change materials, the heat storage and discharge performance of phase change heat storage material is tested and analyzed. And the system of phase change heat storage with new thermal oil medium temperature solar energy supply was analyzed and studied, and finally compared and analyzed with some typical phase change materials. The results show that the new composite inorganic hydrate salt with a phase change temperature of 95 ℃ has excellent heat storage and dissipation performance in the medium temperature solar energy supply system, providing a reference value for the development and engineering application of solar energy with phase change thermal energy storage technology.