It is difficult to determine gauge point and calibration value in extinction coefficient inversion of airborne lidar that detects in low altitude. Fernald iterative backward integration method can find gauge point and calibration value for extinction coefficient inversion without other auxiliary equipment when airborne lidar is used for low altitude detection. Airborne lidar data of Qingdao is disposed using Fernald iterative backward integration method and Palm et al.(2002), and two extinction coefficient profiles agree with each other well. Quantitive analysis reveals that lidar ratio influences extinction coefficient profile inversion results greatly. Extinction coefficient of gauge point and iterative criterion value influence little extinction coefficient profile inversion results. Fernald iterative backward integration method offers a method for extinction coefficient inversion of low altitude detection lidar without other accessorial equipment.