Abstract: As a important part of the reservoir mechanism research，not only the static description of the geological bodies，but also the dynamic attention of petroleum migration should be considered together in the passage system study．Based on the correlation between oil and source rocks，analysis of faults and sand bodies，and the analysis of oil accumulation history，this paper discusses passage system of Liangjialou oil field in Dongying sag．This paper suggests that the effective source-rocks in the upper part of the fourth stage，the middle and lower parts of the third stage of Shahejie Formation were connected with reservoir through synsedimentary faults, and the vertical migration was the major type of accumulation in Liangjialou oil field．The growth fault is the most important element in the passage system，and the accumulation stage is determined by the active stage of faults．The model of petroleum migration is controlled by the distribution of effective source rocks and the motion type of faults．