The offshore, deepwater and equipment concentration development trends of port requires better windbreak capacity of port handing equipments. The portal crane is taken as research object, and the wind field’s characteristics and whole crane wind load of the portal crane under sudden strong winds or gusts are researched. The CFD theory and FSI analysis methods are used to analyze the distribution of pressure and velocity in the apron fluid field. According to the results, the fluid structure interaction analysis function of ADINA software are used to make numerical wind tunnel simulation and analysis, and quantify wind load’s composite force and moment in each coordinate direction of the crane. Base on above results, the ways of port windbreak are analyzed and the results will provide management strategy and theoretical basis for windbreak safety of port crane.