Abstract: Based on the non-geostrophic Q-vector,taking account of the main heating forcing factor-diabatic heating of the development of synoptic system,the concept of non-geostrophic wet Q-vector was proposed,an expression of the non-geostrophic wet Q vector and the whole non-geostrophic ω equation,in which the divergence of non-geostrophic wet Q-vector was taken as an only forcing term,was derived in this paper.At the same time,the non-geostrophic wet Q-vector was applied to diagnose a torrential rain process in North of China.The results suggested that the non-geostrophic wet Q-vector could clearly reveal the system development of the torrential rain; the corresponding relation between the divergence of the non-geostrophic wet Q-vector and the rain area was better than ω and the divergence of dry Q-vector; the negative area of the divergence of the non-geostrophic wet Q-vector could forecast the rain area of six hours in the future correctly,and its center value had positive correlation to the intensity of six hours precipitation in the future.It provided more valuable information for short range weather forecasting,the torrential rain especially.