This paper research on the multi-flow structure of extrusion die, with Circumference uniformly distributed method that all flow channels are set in a same cycle. Combination with the production of certain explosive, Simulates the progress of production of explosive and Analysis the distribution of velocity parameters to judge the quality of the structure of mold. The result show that flow speed at the same position of different flow channel is tiny difference, with the small difference at different positions of same circumference within the same flow channel, it can generally meet the requirements of the production. Key words-Extrusion die, speed distribution, simulation, analysis, Circumference uniformly distributed method