Skyhook is an efficient way that can greatly save spacecrafts' energy. The core function of the Nautilus is to transit the spacecraft to its destination as a sky hook. In addition, it also provides hotel, tourism, entertainment, offices, scientific research and other services. The power sources from nuclear energy, solar pressure and solar energy. It resist cosmic radiation through the artificial magnetosphere; By recycling space waste and exploiting planetary resources, it gets supply and expansion materials for itself, and the rest can create economic benefits by sending back to the earth.