The beat frequency system is set up with two sets of Laser frequency stabization schemes using NH₂D stark cell under the conditions of no special vibrationproof, thermostatical measurement and cooling the Laser tube by the mechanical pump water. and we proceed with the beat frequeney experiment. The data of the beat frequency are dealt with in real time by computer, and the Laser frequency Locking stabilization is estimated by the Allon square deviation. The results obtained are as follows: The frequency-stabilized stability of system is more than 4×10^-10，when the sample time is 1s and 10s respectively. The frequency-stabilized stability of system is more than 1.7×10^-9，when the sample time is 100ms，10ms and 1ms respectively. The key technology is given in the paper.