According to the brief introduction of the VOR principle and signal characteristics, the demodulation of VORsignal is analyzed based on the principle of software radio.The demodulations include reference phase signal demodulation andvariable phase signal demodulation The calculation of azimuth angle and voice information are realized and the system is simulatedrely on the analysis by applying MATLAB software.Some factors which have the influence on the precision of signal demodulationare put out in this paper, the foundations are provided for the design of VOR receiver.