Abstract: In this paper the effects of aerosol on tropospheric ozone measurements by three-wavelength(266-289-308nm)dual differential absorption lidar(DIAL)and two-wavelength(266-289 nm and 266-308 nm)diferential absorption lidar are simulated and ozone profiles from 2 to 3.6 km altitude at Hefei are measured.Reults show that the the three-wavelength dual-DIAL method is more effective to reduce the effects of aerosol than the two-wavelength DIAL method,and more accurate ozone density can be obtained by the three-wave-ength dual-DIAL method.In the meantime,the laws of aerosol effects are foum don DIAL measurements in tropospheric ozone.Measurement results show great agreement with simulation conclusions.