The NH code modulation of Beidou B2 satellite navigation signal causes the problem of high bit reversal rate,which results in difficulty to directly apply the coherent integration over periods longer than 1ms as capturing weak Beidou B2 satellite signal.Besides,it needs to search again to determine the acquisition of NH code chip position.Based on half-bit acquisition algorithm,an improved acquisition algorithm is proposed which combines the feature sequence and half-bit algorithm according to the characteristics of B2 signal.The proposed algorithm handles both of high bit reversal rate problem and NH code chip positioning problem.Experimental result shows that the performance of the proposed algorithm is not only improved about 2dB compared to the non-coherent algorithm,but also does not need additional steps to determine the NH code phase.