Because a certain project in Pakistan is affected by the construction period and natural conditions，the whole unit unloading must be carried out in the specific window period when the wharf has not been completed，and the ship type used for transporting the ship unloader is far beyond the designed ship type of the wharf，so temporary mooring facilities need to be arranged. In this paper，a series of comparison and research work are carried out to analyze the mooring force of ships under the combined action of wind，wave and current by numerical simulation software，and a temporary gravity mooring scheme which can be quickly assembled and dismantled is proposed and put into practice. The engineering practice shows that the system has the advantages of high reliability，good economy and convenient construction.