With the rapid development of network communication technology, a variety of network technology and communication technology has been integrated into our lives and work, bringing great convenience to our work and life. Current research in wireless sensor network technology in the field of communication technology is more popular because of the use of wireless sensor network technology can achieve the communication between objects and objects, people and things, the application of this technology has greatly expanded the ability for people to obtain information, have important significance to the development of people and society. Based on the powerful function of wireless sensor and bring the influence of people, this paper focuses on the design and implementation of the target tracking system based on image sensor networks with Wi-Fi.