Abstract: This paper lays stress on the effect of the non-linear disturbance of wind field and temperature and humidity field.From the analysis of different heavy rain cases, it is shown that great attention is required on motion characteristics in the non-Coriolis force field, which indicate abrupt and sharp changes in heavy rain processes.The non-linear interaction between horizontal disturbance of the stratified stability and vertical motion excites sub-synoptical scale circulation.It is closely related to the evolution of heavy rain processes.