It is widely appreciated that the launching, transportation and installation of 2 000 t plus large-sized caisson can be conducted by the semi-submersible barge, and those of the small-sized caisson of less than 500 t can be conducted by the floating crane. However, there is not a common opinion on the launching, transportation and installation of medium-sized caisson between 500 t and 2 000 t. Taking the land formation engineering of Beihai LNG receiving station in Guangxi region as a study case, we expound the superiority of launching, transportation and installation of the medium caisson using large float crane combined with panel square barge from the aspects of the environment,economy and technology and probe into the relevant construction measures that must be paid attention to.