BOC modulation is a type of new modulation method, which realizes the split of spectrum to make full use of the available frequency bands, and has important application value and development prospect. In this paper, the signal characteristic of BOC(10, 5) is analyzed in detail,the power spectral density function and correlation function is analyzed and stimulated. A segmented interative fast acquisition algorithm based on FFT is proposed, aiming to improve accuracy of fast signal acquisition. The simulation and experimental results are given to demonstrate that the software receiver can perform BOC(10, 5) modulation signal acquisition successfully,which can provide a good technical support for navigation signal processing algorithm research and navigation receiver development.