Abstract: This paper introduces the theory of permanence of updating ratios for integrating multi-discipline data in reservoir stochastic modeling.Compared with the traditional methods for multi-discipline data integrating，the hypothesis of the theory of permanence of updating ratios is weak and consistent with the real world；further more，the probability is deduced strictly. It has the superiority of easily integrating data and can integrate data of different sources，different resolutions and different confidences into reservoir model easily.A real reservoir model of integrating seismic data is implemented both by using this new method and the traditional method.The result shows that the method of permanence of updating ratios is more robust in integrating data than the traditional methods，for the model built by the former is much more closer to the real facies distribution than the traditional one.The cross validation also proves that the new method is much more precise.So the method of permanence of updating ratios can be put into use in real oilfield for the stochastic modeling with multi-discipline data.

Key words: the theory of permanence of updating ratios, multi-discipline data, integrated modeling, reservoir geological model, Dagang Oilfield