An analytical representation of the Zeeman laser beat frequency function is given. It is used as a frequency discrimination curve for frequency stabilization of a 633nm He-Ne laser. When the laser is stabilized to the minimum of the beat frequency curve, frequency stability is about 1-2×10-10, and the resettability is 1-2×10-9. This stabilized laser can be used for precision measurement and spectrosoopio experiment. It is also used as a second frequency or wavelength standard.激光