The control technical research on multi-channel 0°-360° digital phase shifter is conducted. A multiplex all-phase phase shifter is implemented by using serial device server and scheduling controller. The testing results indicate that the proposed method is feasible, which is convenient for the engineering realization of multi-path control. It is found that there is a non-linear change of phase-shift accuracy under different bandwidths and large phase shift conditions. To solve the problem, an improved method based on software programming is put forward.