A1.52μm single-mode He-Ne laser with internal mirror in transverse magnetic field have been successfully developed. A method is suggested that laser frequency on looking condition can be continuously tuned along optimal S type curve. By this method laser frequencies have been obtained with a relative frequency stability in the order of 10-11, sample time of 0.1-1S and over a wide range (100 MHz). It can be used as a optical source in the single-mode fibrle communication.