Abstract: The jacket is required to dock to the subsea wellhead template in the development program of an oil-gas field in the X block of East China Sea, which increases the difficulty of jacket installing. On the premise of that the design and installation of jacket and subsea wellhead template conform to the relevant specification, together with the consideration of the climate and the flow velocity of seawater in site, the operation was performed, thus it reduced the risk of installation and ensured the success of installation. This paper introduces a successful example of the operation in X block of East China Sea, analyzes and summarizes the experience, and provides a reference to the similar program in the future.