GPS is a new generation of navigation and positioning system established by the U.S. Department of Defense to meet the military need of high precision navigation and positioning of the sea, the land and air facilities. It has a global, round-the-clock, continuous three-dimensional precision navigation and positioning capabilities [1]. However, GPS receiving is especially vulnerable to be jammed. At present, the applications of GPS on the military and civilian in China have been increasing in scope and volume, and therefore the study of GPS jamming technology should also be accelerated. The study not only covers GPS jamming technology to make the other side's advanced equipment fail, but also focuses on the advanced technology of GPS anti-jamming.