The infection of the room temperature to the differential laser gyro’s null shift is very complex. In order to finding out the infection mechanism, surface temperature, gyro’s null shift, laser intensity difference and sum between the two signals, current difference between the two arms discharge and the sum frequency are tested at the same time. Through analyzing and calculating the correlation coefficient between temperature and other, parameters, it is found that the correlation between the gyro’s parameters and surface temperature is different along with testing time. It’s also different between different experiments, so the effect of temperature compensation is limited. The sum frequency is proportional linearly to the temperature, but the linearly proportional coefficient is different along with testing time and different experiments.