A new method for correcting scattering laser lidar data is reported. Firstly, in the insufficient overlapping range between the transmitting laser beam and the field of view of the receiving telescope, the logarithmic range-adjusted power curve S(r) is fitted with conic, and the difference between the conic and the original S(r) in the short range is gotten. Secondly, the slope of curve S(r) in short range is obtained by fitting the curve S(r) in the long range on the assumption of an almost homogenous atmosphere. At last, by adding difference signal to the fitting line of S(r) in the short ange, the short-range S(r) is corrected. The correction results are close to the real atmospheric conditions.