The temperature characteristic of basic substances in ring laser gyro (RLG) can generate bias drift, and the long time continued manipulation of RLG increases the bias drift which will deteriorate the performance of gyroscope dramatically. Then the method for temperature compensation is investigated, and the compensating model is gained by effects with different models. The relationship between mechanically dithered RLG′s bias and multi-temperature is studied too. Based on the influence of different experimental temperature models, two temperature sensors can be simplified for the redundancies. Thus the experiment of data subsection is designed to validate the practicability of this temperature model. The result shows that multi-temperature compensation models are better than single-temperature models; the simplified multi-temperature model can reduce the computing scale, and still satisfies the requirement of real-time compensation; by using this simplified model, the compensation precision can be improved by 1.6 times at least, and the bias stability compensated are all on 10-3(°) /h level.