This paper briefly introduces the working principle of typical flow batteries,and the structural characteristics,physical property and chemical property of graphite felt.It focuses on the application of nanoparticle modified electrodes in flow battery in recent years,and compares and analyzes the optimization effect of different modification processes and different nanoparticle types on the performance of electrode materials.Furthermore,the mechanism for nanoparticles to improve the electrochemical activity of electrode materials is summarized.Finally,the future development directions are proposed for improving the efficiency and reducing the cost of the battery.