Abstract: Top Tension Risers (TTRs), serving as the production riser for a dry-type tree, typically has a double-casing structure. At present double-casing TTR is simplified as an equivalent single-layer pipe neglecting the interaction among the pipe columns, which cannot accurately reflect the stress state of each pipe column. The double-casing TTR is modeled as an Euler-Bernoulli beam with the upper end connected to a tensioner and the lower end fixed. Considering the contact effect of centralizers among pipe columns, the coupled motion equations are established and solved by Newmark-β method to analyze the dynamic response of the double-casing riser under platform excited motion. The results show that the stress distribution of the pipe columns show significant differences. The influence of centralizers on the motion response of each pipe column varies with water depth. The upper part is significantly affected by wave loads, and centralizers can effectively reduce the motion response of the outer casing. The lower part is more influenced by the contact force of centralizers, and the spacing of centralizers can be appropriately increased. A centralizer height of 80% of the space among pipe columns is found to be optimal, as it reduces the motion response of the outer casing while minimizing the contact forces on the inner casing and oil pipe. The top of the riser is connected dynamic elastically boundary, and the axial stiffness of the riser is adaptively changed. Compared with a pinned connection, the motion frequency and amplitude of the TTR top are reduced, indicating that the tensioner has a obvious buffering effect between the platform and the riser.