It is an independent space station composed of three modules, including the sky and core module, the sky test module and the dream test module. The design is designed to support long-term habitation, capable of accommodating at least three astronauts for at least 10 consecutive years. The design and construction are completely independent. Each module has an independent power supply, control, propulsion and measurement and control system. The assembly and construction are completed through rendezvous and docking and on-orbit plane transposition. It provides a "space home" for astronauts and a "space laboratory" for scientific research, supporting space science experiments and technological experiments in multidisciplinary fields.

Node 3 Tranquility is a module of the International Space Station (ISS). It was launched by the Space Shuttle Endeavour on February 8, 2010 and docked with the International Space Station on February 12, 2010.