In cognitive radio networks, malicious user (MU) sends a signal which is similar to the primary user's (PU) signal, leading to the secondary user (SU) can't access to the spectrum of communication networks, which is named primary user emulation attack (PUEA). In this paper, we first propose a cognitive radio networks model with motional users, while MU and SUs are made up of an approximation centralized cooperative sensing networks. The motional users include two SUs and a MU. When MU and SUs move in the certain range, MU could attack SUs heavily by adjusting its transmission power real-time. According to the proposed model, a PUEA scheme with motional users will be verified based on different HDF (Hard Decision Fusion). The simulation results show that the proposed PUEA with motional users is intelligent and stable.