Kinetic energy balance and distribution were computed and compared for land edtyphoons 8116 and 8407,the former decaying quickly and the latter maintained for long before disintegration, ResuIts show that the short-lived storm was related to the horizontal flux divergence of upper troposphere kinetic energy and cross-isobaric motion,and the long-lived one had input of kinetic/potential energy from the ambient atmosphere, presumably an important cause of the persistent maintenance of the typhcon′s warm depression,In the end,relation was investigated between the horizontal flux divergence and typhcon heavy rain enhancement.