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In this paper, a bit error ratio (BER)-based relay se-lection strategy is investigated under opportunistic relay selection. The chal enging problem is to design the relay selection rule so that the relay is able to measure the performance of the coopera-tive system at the destination exactly with low computation costs. This paper derives a closed-form expression of the end-to-end bit error rate firstly. Then, an approximate BER expression based on the relationship between the instantaneous signal-to-noise ratio (SNR) of the relay-to-destination link and the probability of error propagation is derived. Final y, a simplified relay selection formula is proposed. Simulation results prove that the proposed relay se-lection rule can reflect the BER of each relay properly as wel .