Relations between bit error rate and average received signal-to-noise ratio （SNR） in AWGN channel were derived for three modulation modes defined by Bluetooth 2.0+EDR new specification. The function expressions of packet retransmission probability and average received SNR of ACL packets were put forward. The transmission performances of ACL packets

including average throughput

average retransmission times and average transmission delay

were investigated through the retransmission probabilities and characteristics of packets. The Adaptive packet selection strategy in AWGN channel was presented. The maximum throughput was obtained by selecting the appropriate packet types to transmit in different SNRs. The SNR threshold values for packet type switching were also presented. The analysis results and strategy presented adapt to optimizing Bluetooth data transmission performances.