This paper describes the use of SOPC technology to design a wearable computer system with three processors sharing resources,the main processor is mainly responsible for the running of the operating system and application software,the network processor is mainly responsible for handling messages,the DSP processor is mainly responsible for the processing of the video and image data.This paper describes in detail the implementation mechanism of the multiprocessor system based on Nios Ⅱ and FPGA,discusses the use of hardware mutex to realize multi-processor resource sharing and gives the specific steps for the design of the hardware,the design of the software,testing methods and key technology.Introduces the structural features of the network processor Nios Ⅱ and customized instructions and design methods for forwarding software of the network processor based on the Nios Ⅱ soft-core processor and design methods for the DSP processor used for the processing of the video and image data.After verification,the three-processor system very well adapted to the wearable computer's micro and small and low-power design requirements.