The SIoT (space-based Internet of Things) is an effective supplement and extension of the ground-based IoT, and it is a basic technical means to build the interconnection of all things and ubiquitous perception. Taking the SIoT integrated in TianTuo-5 as an example, it aims at the application requirements of multi-domain and multi-scenario covering land, sea and air. It focuses on solving the high-reliability detection of the signals of AIS (automatic identification system), ADS-B (automatic dependent surveillance-broadcast) system and the multiple access of DCS (data collection system). This achieves real-time supervision of navigation and aviation goals and the global layout of extremely massive narrowband IoT sensor terminals, and provide reference scheme for the demonstration, construction, development and scale application of our country′s SIoT.