Abstract: To study influence of typhoon in the regional air environmental quality in China,this paper analyzed the important pollutant PM₁₀ and the relevant meteorological data during two typhoon processes in 2005.Results show that there were obvious pollutant processes in the cities in China.Based on the data of regional environmental data and meteorological data,we diagnosed and modeled two typical processes.Research illuminated that the typhoon system is the important reason for the heavy pollution in some cities such as Beijing,Shaoxing in the outer area of typhoon,and for the atmospheric environment background in this region is very useful to accumulate pollutant.