Two independent resonators have been set up by using wide band polarization maintaining fiber Bragg grating(PFBG), common active fiber and narrowband common fiber Bragg gratings(FBG), and the central wavelength of the narrowband common FBG aims at one of the reflective peaks of PFBG, which can output stable dual/single wavelength single polarized laser.The Dual-wavelength of single polarized fiber laser based on common active fiber is fabricated and the fiber laser can output dual/single wavelength at normal temperature. The optical noise-to signal ratio(ONSR) of dual-wavelength laser is 46.7dB, and 59.6dB for one wavelength laser. The degree of polarization(DOP) of fiber laser is 98.5% by HP 8509B. This technique can be used in generation of microwave/millimeter-wave for radio-over-fiber(ROF).