For high quality and efficient completion of prefabricated caissons in the temporary caisson precasting yard，to overcome the disadvantages of the traditional caisson bedding craft,like waste of resources,high cost,pollution precast yard,slow construction progress,etc.,we carry out an in-depth investigation on the caisson bedding craft by computational analysis,and innovatively use H-beam and square wooden for bunking the caisson and lifting up caissons by the lifting gas bag to extract square wooden,and the square wooden can be recycled for the next caisson bedding.Practice proves that the technology is reliable,practical,and cost-saving,thus it’s better than the traditional one.