Abstract: The energetics process of offshore typhoon in three kinds of explosive development are analysed using ECMWF data. The results are as follows: ① During the explosive development process,the enhancement of the rotational kinetic energy is mainly in the lower tropsphere while that of the potential energy is in the upper troposphere The magnitude of rotational kinetic energy is largely bigger than that of divergent energy. ② The environment energy advected into the typhoon was about 30% of the internal increment of typhoon energy. The magnitude of energy was an order larger than increment of typhoon energy. ③ Among those three kinds of explosive edevelopment typhoon,the energy transformation mechanisms are different. ④ The influence of environment fields on abrupt intensification of typhoons couldn't be overestimated.