Abstract: Horizontal four axis machine tool, the author of this paper under the condition of no point point follow function, unable to realize the problem of automatic compensation in any position to coordinate system, through the analysis of the tip point follow the principle of combination of machine tool structure and arbitrary point coordinate transformation after the machine tool coordinate and machine coordinate system transformation relations, coordinate system automatically compensate macro program,For development research, based on NX post-processing in NX programming platform in the form of event driven post-processing, complete coordinate system automatically compensate macro program automatically output, realize Hua zhong NC system horizontal four axis machine tool coordinate system automatic compensation, product processing in the machine table any position, improve the applicability of the four axis nc machine tools.