In order to cope with the problem of low efficiency of GPS spoofingsignal injection, a GPS spoofing pattern based on denial environment which covers for signal injection is proposed. With an analysis on exchange of signal carrier noise ratio, the acquisition and tracking of spoofing signal in this pattern is discussed. Given representative parameters of GPS signal and receiver, the preferential signal ratio of spoofing signal to authentic signal and power of bandlimited white noise are calculated for the requirement of constructing denial environment. This jamming pattern is proved from the perspective of acquisition and tracking of spoofing signal, at last the general limit of signal ratio of spoofing signal to authentic signal and power of bandlimited white noise are deduced.