A mathematic model is constructed to simulate the dry deposition of gases andaerosoas under different conditions,and there with the sensitive factors controlling the deposi tion are examined,thus revealing the features and laws.Results show that the properties ofthe underlying surface,gases the mselves,miscibility and humidity of the particles surfacerepresent the main factors affecting the dry deposition of gases,and the aerosol's diameter,its surface roughness,mean windspeed and atmospheric stability are of significance to theparticle's dry deposition。