Abstract: Aimed at the requirements for bracket plastic parts forming, a design for their mold structure and part processing were carried out by the UG software under the integration of CAD. The layout of one mold and one cavity were adopted for the mold structure. The function action includes one times opening, two times ejection and four side-core pulling. The combination of hot runner and cold runner are adopted so as to meet the requirement of thin-walled area filling. A balanced piping system is used to ensure the temperature control of mold cavity. During the structural design of the mold, in the case of the demolding process with difficult demolding characteristics, four outer walls were driven by an integral double guide pillars slider mechanism for short-distance core-pulling demolding. As for the inner wall, an integral double-ejector oblique ejector block was used for core-pulling demolding. In the case of the screw column, the ejector tube is used for complete. Moreover, the ejector pin is used for complete demolding of the plastic parts. A second ejection control mechanism was designed for the ejection plate to realize the opening and closing of the two ejection plates by the movement of sliders. The errors caused by the transfer of intermediate data in the mold processing can be reduced by means of the integrated CAD design based on the UG software. This is advantageous for improving the accuracy of mold processing, effectively reducing the cost of mould production and shortening the manufacturing cycle of mold.