The deep evolution of the world economy and geopolitics, the complex international situation, and the profound changes in the global energy landscape pose enormous challenges to China's energy security. The conceptual evolution and evaluation model methods of energy security were outlined. Indicators were selected from the four dimensions of energy availability, accessibility, affordability, and acceptability to construct an energy security evaluation index system. Entropy weight TOPSIS （technique for order preference by similarity to ideal solution） comprehensive evaluation was used to assess china's energy security situation from 2007 to 2022, and it is found that the overall level of energy security in China is showing a trend of first decreasing and then increasing. In order to improve the level of energy security, countermeasures and suggestions are proposed.