This paper aims to alleviate the power imbalance problem of the current power grid by proposing a combination of cold storage materials and cold storage. In order to relieve the load of power grid, the phase change material can store cold in the low peak period and release cold in the peak period. The thermal properties of different materials were measured to screen out the phase-change cold storage materials suitable for the temperature of the cold storage, and the cold storage plates were made and tested in the actual cold storage. Temperature data was collected and analyzed through temperature measurement points placed in the cold storage. The temperature fluctuation in the cold storage where the cold storage plate was placed was reduced from 2 ℃ to 0.5 ℃. The coefficient of temperature unevenness in the cold storage with cold storage plates was 0.56 after 4 hours, while the coefficient of unevenness without cold storage plates reached 1.2 at 2.5 hours. Compared with the others, the temperature rise of the cold storage with cold storage board was delayed by 126 minutes at the highest. After 3 hours, the temperature of the cold storage with cold storage plates increased by 8 ℃, while the temperature of the cold storage without cold storage plates increased by 13 ℃. The cold storage plate can effectively alleviate the temperature rise of the cold storage and make the temperature distribution in the cold storage more uniform. In the future, the heat exchange can be enhanced by enhancing the thermal conductivity of the cold storage material and the cold plate material, and adding fins to the cold plate to achieve a better cooling effect.