To achieve the goal of interfering enemy GPS navigation facilities, this article advances a new deceptive jamming approach which could realizing dual deception both on the position and the speed, and provides an algorithm to calculate the deceptive control variables. The major jamming process is detecting the track of the target, calculating control variables of each satellite, and transmitting the deceptive signals. This method is adapted to both GPS CA code and GPS Precise code, what more important is it is much difficult to be detected and restrained, in a word; it provides a new efficient satellite countercheck in the navigation war.