Abstract: In this paper are described first the differential equation and finite element formula for fluid migration under the action of crust stress in a porous rock. Then the oil migration potential field in Liaohe oil field are calculated by using finite element method based on crustal stress measurement. The result shows that most prospective oil fields are in low migration potential areas and transition areas from low to high migration potential. The study combining oil migration with tectonic analysis may provide the basis for exploration and development of oil and gas field.