A structural equation model has been developed to study the perceived risk of smog，related factors and coping behaviors，based on the data collected from a large-scale questionnaire survey during the recent se-rious smog time． Ｒesults show that individuals who are more sensitive to environmental information，who have a higher level of perceived risk and more knowledge about smog，and who perceive more controllability，will be more likely to have protective and coping behavior，and more willing to purchase health protection prod-ucts． In particular，perceived risk plays as a strong mediation role between environmental information and cop-ing behaviors as well as environment satisfaction． In other words，when smog pollution arouses public per-ceived risk，they will take more coping behaviors and will give a worse evaluation of the environment． In addi-tion，the perceived controllability of smog plays a partial mediation role between the familiarity of smog knowl-edge and coping behaviors，and between the familiarity of smog knowledge and environment satisfaction．