Abstract: The evolution of synoptic types of serious contamination,the structure of vertical stratification of temperature and humidity,and the character of regional atmospheric contamination in the heating period of 2000 to 2001 were analyzed.The serious regional contamination is under the background of complex systems in which various synoptic types of serious contamination affect each other,including the systems of contaminant transport,convergence and synchronic accumulation under various synoptic types.The phenomenon of regional synchronic contamination in North China plain is restricted by persistently steady zephyr at high altitude and various steady synoptic types at low altitude.The difference of pollutant index in different regions at the same time is related to the structure of emission source groups and the motion and evolution of synoptic types of transoprt and convergence.The temperature and humidity stratification of serious regional contamination is mostly of bell-mouthed shape(except for sand dust contamination).