The whole structure of automobile flange shoulder nut is complex and the wall thickness of shoulder is thinner, so it is difficult to form. In order to meet the needs of mass production for parts, based on the theory of plastic forming, two kinds of multi-station cold heading process schemes were preliminarily designed. Then, the forming processes of the two kinds of process schemes were simulated by software DEFORM-3D respectively, and the distribution conditions of equivalant stress，equivalant strain and damage value for workpiece，and the variation law of forming force in the forming process of part were analyzed. The results show that the flange shoulder nut can be produced by the two kinds of process schemes, which are full filled without shrinkage, folding, cracking and other defects. However, the forming force distribution of each station in process scheme 1 is more uniform, and the damage value of workpiece is smaller. The production process test shows that the parts produced by the process scheme 1 meet the design requirements. By comparing the actual overall dimensions of parts with the simulation results, the errors are within the reasonable range, which verifies the consistency between the numerical simulation and the test results.