In order to study the vertical structure characteristics of atmospheric pollution under different weather processes, the perspective of the weather system, horizontal wind field, vertical velocity and echo intensity were analyzed comparatively form two rain to snow processes in Shenyang by using the conventional and unconventional meteorological data and atmospheric pollutant monitoring data. The results show that it had stronger intensity, concentrated region of pseudo-equivalent potential temperature was stiff under 850 hPa, lower frontal slope was sharp with a short frontogenesis time, increasing pollutant concentration was fast, strong temperature advection led to the obvious pollutant transport, features of reflectivity was changing very rapidly during rain to snow in the process I. It had weaker intensity, magnitude of inclination of pseudo-equivalent potential temperature was small, lower frontal slope was gentle with a long frontogenesis time, increasing pollutant concentration was slow, there was a large vertical velocity and development of clouds was favorable, influence of wet deposition was clear in the process II. The concentration of pollutants reached the maximum during the period of rain to snow.