Abstract: In order to solve the problems of complex circuit design and low precision wiring design in the process of electromechanical product design and manufacturing under the background of mass customization, a three-dimensional intelligent wiring method based on SolidWorks was proposed. A^* algorithm was improved to automatically plan the optimal wiring path, and a wiring space definition method based on channel network was proposed, which restricted the generation of wiring path and guaranteed the correctness of wiring path. Finally, the corresponding wiring system was constructed through secondary development, and the feasibility of this method was verified. The results show that this method can effectively improve the efficiency and accuracy of product circuit design.