Recently, laser scanning technology has improved significantly. It has facilitated sampling part surface data with speed and accuracy. It is necessary to manipulate these large amounts of point data. Based on analyzing the adaptive minimum distance (AMD) method and the octree structure method, an improved direct data reduction method was proposed. The method can streamline the large number of point cloud data directly and effectively. And the experimental verification is carried out by comparing the data. Finally, a summary of the advantages and disadvantages of the method has been done.