Based on the air quality datum from 2006 to 2014,annual,seasonal and daily variations of air quality in Liaocheng were studied. It is found that atmosphere quality appeared declined significantly in 2013,and the main pollution factors were PM_(2.5),PM_(10),mainly resulting from the municipal construction. In the aspect of seasonal variations,the air quality conditions were the worst in the autumn and winter,which ascribed natural climate changes and human activities such as heating. In the daily variations,pollutant concentration at rush-hour rose significantly. On the basis of analyzing the main factors influencing atmosphere quality in Liaocheng,the suggestions and countermeasures to improve the atmospheric quality were put forward.