Abstract: Traditionally, a hardware stabilized platform to maintain spatial stabilization of antenna scanning is frequently used by airborne radars. Nowadays, research on the usage of data processing method to achieve electronic stabilization in the scanning airspace is leading the development trend. In this paper, aiming at the problem of changes of the antenna beam pointing angle caused by the motion of airborne platform and the resulting decrease in detection accuracy or even the loss of the target, the method of beam steering to maintain spatial stabilization for one-dimensional phase scanning airborne radar is systematically discussed. The mathematical model of the directional angle transformation under the moving platform is established, and the formula of beam pointing angle transformation caused by the platform movement is deduced. The calculation method of one-dimensional phase scanning phase shift code is designed. The key technical indicators such as calculation accuracy, calculation time, beam pointing accuracy and the selection of phase shifter bits are verified by simulation. The results show that the spatial stabilization algorithm is effective and reliable, which provides a general design idea for the beam steering design of airborne phased array radar, and has great engineering significance and practical value.