Intermediate spoofing can control the target receiver successfully without interrupting tracking loop,so it is strongly secret,while it needs to know the accurate antenna position and channel condition of victim.In practical condition,position of victim is often fuzzy,which will influence the performance of spoofing.For a successful spoofing in actual scene with a lower detected probability,it is necessary to research the requirements of GNSS Intermediate spoofing.In this paper,according to the principle of intermediate spoofing,we establish the signal model of intermediate spoofing,and then we analyze the related influence factors based on a fix successful probability,including signals’ interval,carrier‐frequency difference,carrier‐phase difference and code rate difference between authentic signal and spoofing signal.Monte Carlo simulations present the relationship between spoofing‐to‐noise ratio (SSR) and factors,which verify the reasonable of models and theoretical analysis.Thus,minimum SSR for successful spoofing is obtained in the case of fuzzy position of victim,which reduces the risk of being detected.Finally,requirements of successful intermediate spoofing are summarized.The research is based on actual scene,which extends the application range of intermediate spoofing,so it has a guiding significance for designing of GNSS spoofer.