This paper focuses on time alignment algorithms in airborne multi-sensor data fusion, and theoretical analysis is made to the alignment error caused by non-synchronization of time.On this basis, in order to improve the accuracy of interpolation and extrapolation algorithm, an improved subsection linear interpolation algorithm is proposed to solve the time alignment problem, of which the data obtained from different sensors has big differences on time.Simulation analysis is made to the data fusion processing between airborne data link and fire-control radar in confrontation between two sides.The simulation results show that the proposed algorithm has fine applicability to the processing of airborne multi-sensor data fusion.