A tunable, narrow linewidth mid-infrared Cr∶ZnSe laser consisting of X-type cavity pumped by a home-made 1908 nm thulium-doped fiber laser is built. The maximum continuous wave output power is 1.6 W at central wavelength of 2420 nm with respect to incident pump power of 6.8 W, and the corresponding slope efficiency is 26.7%. Littrow configuration is adopted to realize the continuous tuning between 2284 nm to 2716 nm with a tuning range of 432 nm, the full width at half maximum (FWHM) is 0.13 nm. The output power of more than 500 mW is achieved in the range from 2350 nm to 2510 nm by using 22% output ratio of coupling output mirror with respect to incident pump power of 5 W. Littman configuration is adopted to realize the continuous tuning from 2305 nm to 2658 nm with a tuning range of 353 nm, and the FWHM is less than 0.05 nm. The output power of more than 300 mW is achieved in the range from 2350 nm to 2520 nm.