Abstract: When the jacket slides from the barge, firstly applies an external force to the jacket to make it slide and then the jacket can slide by the gravity of itself, eventually the jacket will slide into the sea through the rocker arm. In this process, we should consider the following aspects: 1 ) whether the track is secure, such as the clearance between the jacket and bottom; 2) whether the jacket is away from rocker arm safely;3) whether the final floating position of jacket is stable; and 4) the trim angle of barge. In this paper, we will calculate and analyze the track of jacket＇sgravity center by the method of domain analysis.