Abstract: At present, the research on the acquisition of new signals with pilot channel mainly focused on the design of joint acquisition algorithms, which can increase power utilization so as to improve receiving performance. These algorithms can be divided into two categories: equal length and unequal length coherent integration joint algorithms. For BDS B1C signal, this paper analyzed the weighting problem of three equal length coherent integral joint algorithms, and the relationship between coherent and differential joint algorithm is explained. The theoretical and simulation results show that the coherent joint algorithm has better performance. Furthermore, the design scheme of acquisition parameters is proposed based on the theory of optimal coherent integration time. The performance of the equal and unequal length coherent integration algorithm is compared under different conditions, and the optimal strategy for acquiring B1C signal is given.