Abstract: This graduation project duty is completes the three-way pipe components a mold two cavity injection molding mold design. According to models the actual situation which a structure, the specification and the enterprise produce, with carries on the three-way pipe injection mold design using three dimensional design software Pro/E. This design analyzes the three-way pipe the technology capability, has designed the three-way pipe injection molding mold structure, and through the die space pressure and the locking force computation, chooses the injection molding machine, has given the related craft parameter. Separately to poured the system using Pro/E, divides the profile the selection, the drawing of patterns promotes the organization design, the cooling structural design, and so on has carried on the order to reduce the mold cost, enhances the production efficiency, regarding has the national standards spare part, this design uses the standard letter, including: Note mold standard pould frame; Standard guide pillar, guide sleeve and so on. Regarding has the recommendation size components, selects the recommendation value design, like runner set and so on. Key word: Injects the mold, divides the profile, the exhaust structure, promotes the organization