To reduce magnetic sensitivity of four-frequency differential laser gyro (DILAG),an operating point control method is proposed. Moreover,the magnetic sensitivities of the same gyro with conventional frequency stabilization using light intensity comparison and with the new operating point control method are compared. In the range of 0-0.06 mT,the magnetic sensitivities of two experimental gyros are 62.7 and 111.3(°)/(h·mT),respectively,when the gyros are controlled with conventional frequency stabilization method. However,the magnetic sensitivities are improved to 0.9 and 1.6(°)/(h·mT) respectively,when they are controlled with a new operating point control method. The results indicate that electronic control means are of significance to the magnetic sensitivity. The residual magnetic sensitivity maybe arises from nonreciprocal effects induced by transverse magnetic field,which is going to be investigated in future work.