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A compact,tunable mid-IR difference-frequency generation (DFG) light source based on a dual-wavelength fiber laser and a 5mol％ MgO-doped periodically poled lithium niobate (MgO∶PPLN) crystal is developed and evaluated.An output power of 233 μ W is achieved with a conversion efficiency of 0.1％/W.The mid-IR wavelength can be tuned between 3308 nm and 3314 nm by changing the temperature of a pair of fiber Bragg grating (FBG)taking as cavity mirrors in the dual-wavelength fiber laser from 26.5℃ to 106.5℃.