In order to relax the detrimental disadvantage from high bit rate in di gitalized radio over fiber (D-RoF) system,a D-Rof system based on polarization division multi plexing is proposed,which can improve the transmission capacity of single wavelength channel in the system.In this paper,polarization demultiplexing is realized by using one-way tracking vector (OTV) and two-way tracking vector (TTV) digital signal processing (DSP) algorithms respectively in traditional Sto kes analyzer and simplified Stokes analyzer.The simulation results proves that two-way tracking vector algor ithm can reduce power budget effectively in the orthogonal polarization division demultiplexing system,the n eeded optical power of two-way tracking vector algorithm is 2dBm less than that of one-way tracking vector al gorithm for reaching the best bit error rate (BER) performance.Meanwhile,the polarization demultiplexing is realized in a non-orthogonal polarization division demultiplexing system with a minimum polarization division multiplexing angle of 76° by using two-way tracking vector algorithm and trad itional Stokes analyzer,which enriches the dimension of polarization division multiplexing greatly.The proposed polarization division m ultiplexing D-Rof system is of great significance to its application in 5G wir eless transmission and cable digital TV transmission.