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In order to improve the performance of cooperative spectrum sensing under factors such as shadow fading, this paper improved a cooperative spectrum sensing method based on the combination of dynamic threshold and credibility would be adopted. Firstly, the method used the cognitive users detection signal to noise ratio to filter the cognitive users that have low detecting reliability. Then, the cognitive user based on the detection signal-to-noise ratio set a dynamic threshold, suitable for itself and its energy detection. Finally, the fusion center in conjunction with the single node sensing results and the allocation of transmission credibility made a final judgment. The simulation results show that the detection channel and the transmission channel are severely affected by factors such as shadow fading, this will be compared with mere dynamic threshold cooperative sensing and traditional weighted collaborative sensing method based on trust, the method can obtain a high detection probability. [ABSTRACT FROM AUTHOR]