Phase change material (PCM - Phase Change Material) refers to a substance that changes its material state with temperature changes and can provide latent heat. In the process of changing physical properties, phase change materials will absorb or release a large amount of latent heat, which can be said to be a new type of energy storage. Silica aerogel can increase the number of original phase change materials from 300 to more than 1,000, and the energy storage can still reach more than 77%. Extend the service life of the product by at least 3 times. Compared with similar foreign "microcapsule technology", the cost advantage is obvious. This technology increases the solar energy utilization rate to about 70%, while using solar photovoltaic power generation, the storage energy reheating efficiency is less than 10%.