The characteristics of air scattering and absorption are analyzed, and laser pulse delay time domino effect caused by air scattering is studied. Laser pulse transmission delay time caused the air channel, on the conditions of different visibilities, different transmission distances, different scattering coefficients and one way scattering albedo, is quantitatively analyzed. It can provide theory basis for emendation of detection error.The simulation result show that the path delay caused air scattering is greater and laser pulse transmission delay time is longer, when the air channel scattering is more severe and air scattering coefficient is not changed. while the air absorption is more obvious, the laser pulse transmission delay time is less.