Abstract: Laser scanner records measured distance,angle and reflected laser intensity by sending and receiving laser impulse.The distance and angle data are widely used to acquire point coordinates.However,laser intensity is not made full use in existing studies because of its uncertainty and instability.We presented a method for extracting and classifying building information based on a vehicle-borne laser scanning system.In this method,intensity is corrected according to different scanning angles and distances.Intensity is divided into certain levels,and this is used to show distributing curves of different objects and determine the peak values of curves.Experimental results show that different kinds of objects can be extracted and classified from the peak values.