Abstract: In order to exploit the 1.44μm laser with unique merits in medical application,the multi-mirror technology of(Nd∶YAG) laser is adopt.The mirrors with special coating parameters to different wavelength are designed.By the means of adding the mirrors,the loss of 1.06μm,1.32μm as well as the gain parameter of 1.44μm are increased in resonator.Then the difficult problems of coating requests in two-mirror cavity are solved.The laser oscillation of 1.06μm and 1.32μm has been restricted effectually.Eventually,the transition from 4F(3/2) to 4I(15/2) levels is realized,and the 1.44μm laser is achieved.Theoretic analysis and experimental design show that 1.44μm laser oscillates easier in multi-wave resonator than in two-mirror resonator.