A multi-wavelength fiber laser with phased-shifted fiber grating (PSG) is proposed. The phase-shifted fiber grating with two phase shift points is used as the wavelength selection device which is formed by inserting two phase shift points in the Bragg grating. Under 980 nm laser diode (LD) pumped, stable triple-wavelength can be obtained by adjusting the polarization controller (PC) at the room temperature. The triple-wavelength output power fluctuation is less than 0.6 dB within 25 min. Further more, the temperature tunability of the wavelength of the fiber laser is investigated. The output wavelength can be tuned with the temperature changing from 25 ℃ to 85 ℃. Due to the stable multiwavelength output, the fiber laser can be used in the multiwavelength interference measurement and optical communication systems.