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Based on the DS/SS with excellent anti-jamming ability, an amplify-and-forward (AF) cooperative DS/SS system model with three nodes and BPSK modulation is proposed in this paper. Under single-tone interference and flat Rayleigh fading channel, we derive the moment generating function (MGF) of the overall system instantaneous signal-to-noise ratio (SNR). Using a well-known MGF-based analysis approach, we present the exact symbol error rate (SER) of the cooperative system over flat Rayleigh fading channel. The results show the ability of anti-single-tone interference can be improved greatly using the cooperative method, and the performance of the cooperation system can be improved more when there is light fading channel between the source and the partner.