This paper presented six absorption lines of NH3 molecule in 1.5 μm band. The absorption profiles of the 1.5361 μm wave length laser in six different absorption cell are observed and compared the calculated half linewidth with the experimental value. At the same time the absorption profile and its differential profile of the 1.53735 μm laser passed through an absorption cell filled with NH3 molecule with the barometric pressure of 2.79×103 pa are also observed. Using the results the frequency stabilization can reach 1 MHz.