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The ring laser gyro need to add a dither bias to reduce the lock-in effect. Previous analog dither control circuit is very big and difficult to accurately control.In order to solve these problems, this paper designs a digital dither control circuit based on DSP.through the accurate control to dither voltage on DSP,and put farword a new sawtooth noise which parameters can be adjusted.The experimental results shows that, the digital dither control circuit stability,control precision,noise injection effect is good. The laser gyroscope static test results show that the laser gyro had a higher measuring accuracy by the design system in this paper.