Abstract: The kinetic energy budget of typhoon 8211 over the East China Sea coastal waters is analyzed and studied, using the data of 2.5×2.5 Jogitude and latitude degree tropical grids. Preliminary results show that the typhoon is a strong kinetic energy source, there are larger differences of kinetic energy balance in each generating and developing periods, the role of mean storm circulation and eddy processes is different at each generating and developing periods. We find the major facts are: (1) There are obvious residue of kinetic energy generation in the middle layer of the typhoon developing processes; (2) The variation of kinetic energy generation is related to future strength change of a typhoon.These facts may have certain forecast indication sense.