Abstract: Because the coordinates of linear distribution map are not regular, it can not be numbered according to the traditional method of coordinate value. The automatic numbering method is one of the difficulties in forestry work. Firstly, this paper discusses and analyzes the existing numbering methods, and expounds the shortcomings of the existing methods in detail in the form of illustrations. Based on the existing methods, an improved method of numbering linear patches according to the distance of broken lines is proposed, which avoids the shortcomings of the existing methods, and the automatic numbering tool of linear distribution patches is realized with c# and ArcGIS objects. The tool can number the linear distribution spots accurately and quickly, and preliminarily solve the problem of automatic numbering of linear distribution spots.