To make use of the local sensing results of Cognitive Radio(CR) users in the wireless network at the existence of baleful CR users with higher SNR(Signal to Noise Ratio), a cooperative spectrum sensing method based on trust degree and SNR comparison is proposed. It can reject the baleful CR users with higher SNR in CR network effectively. The simulation results show that the detection performance of the proposed algorithm is better than that of the cooperative Spectrum Sensing based on traditional Or Rule(OR) data fusion criterion and SNR comparison.