A stable potassium magnesium fluoride color center laser operated at room temperature using transversely pumped cavity is constructed.The laser is pumped with a pulse day laser pumped by a nitrogen laser.The single pulse output of the laser is 0.22 mJ,the optical optical conversion efficiency is 7.3 %.The excitation threshold is 0.5 mJ.The divergence of the laser beam is 3.0 mrad.The degree of the polarization of the laser is 0.99.The laser output extends 703 nm to 800 nm and peaks at 755 nm.