In this paper, the realization of mobile internet of things (M-Iot) based on TD-SCDMA network is given. the M-IoT service can extend the business application of TD-SCDMA system, enrich its traffic functions, and extend its application scenes. at the same time, M-Iot expands the application of IoT. the network framework of realizing M-IoT is described. the communication protocols are discussed in detail. through OPNET modeling and simulation, the result shows that M-IoT can realize the mobile information interactivity for the fixed object and the mobile object. M-IoT based on TD-SCDMA network can not only expand the application of IoT, but also benefit the promotion of TD-SCDMA network applications.