Abstract: Based on the work of Chan and Cho, a meso-β scale potential disturbance was replaced by a meso-a scale potential disturbance,and add an elevation function-H(z),as: θm=△θm·exp-(x-x0)2/Lm2·H(z) The distributions of relative humidity were changed two experiments which could be compared each other, and run the NSI semi-geostrophic humid atmosphere frontogenesis model produce. After run a period,some contour charts of some physical variables were drew, the effects of diabatic heating and initial potential temperature disturbance on were analyzed and compared physical variables.