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In spectrum sensing, single point detection due to their own limitations is facing some problems such as hidden terminal, perceived sensitivity of the end, etc. Two nodes cooperative spectrum sensing schemes based on DF (Decode and Forward) protocols were proposed to achieve spatial diversity gains in cognitive radio networks, which were referred to DF-CSS(DF-based Cooperative Spectrum Sensing), respectively. This paper is based on DF retransmission spectrum sensing, and analysis the detection of Rayleigh fading environment program for the theoretical. At last, the advantages of collaborative by comparison the cooperative detection with the single point performance is showed. Keywords-Cognitive radio; Cooperation detection; Decode and Forward; Probability of detection

Research Of Spectrum Sensing Based On Decode and Forward Retransmission