A new heavy oil thermal recovery mode is proposed for an oilfield development project in Bohai Sea, to build a moveabel steam injection platform, which is connected with thermal recovery platform through bridge, and alternately provide qualified steam for multiple thermal recovery platforms. The steam piping will be stretched, compressed, or twisted duo to relative movement of platforms caused by wind, wave, current and other factors.Therefore, compared with the conventional design of steam pipeline or bridge pipeline, the design difficulties of bridge steam pipeline of moveable steam injection platform are: high temperature and high pressure steam can not be connected by flexible hose, but only by steel pipe; Large bridge displacement will cause large diplacement stress and large sustained stress; Alternating stress, which is prodcued by temeratrue change and displacment change duo to wave random wave movement, gradually accumulates, resulting esulting in fatigue failure of the pipeline. Combined with ASME B31 3 and DNV specifications, and based on CAESAR II stress analysis software, detailed static analysis and fatigue analysis of steam pipeline are carried out. The above difficulties are solved, and the feasibility of transporting steam for thermal recovery platform through movable platform and bridged is demonstrated.