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Low power and small volume are always the most important issues in the internal module of a wireless implantable neural recording system. In this paper, a BPSK demodulator base on digital-analog hybrid COSTAS Loop is presented. A digital multiplier replacing the analog multiplier is presented specially to achieve lower power consumption in the proposed circuit. The proposed BPSK demodulator features with a data transmission rate of 1 Mbps and consumes 485.4uW under a supply voltage of 3.3V, which has been implemented with a Chartered 0.35um CMOS process. The area of the chip is only 0.17mm2. Test results show that it can work correctly.