The current force on a ship is one of the most important design factors of open sea terminal. With the comparison on calculation method in Load Code for Harbor Engineering (JTS 144-1—2010), OPTIMOOR calculation software, BS 6349, Mooring Equipment Guidelines (OCIMF-MEG3—2008) and MIL-HDBK in a same example condition, the calculation results are analyzed and verified by physical model test. The study result shows that the error of calculation in Load Code for Harbour Engineering (JTS 144-1—2010) is large, when the current angle is between 15°and 165°, but some foreign standards’ calculation results are identical with the physical model test data. Therefore, it is better that transverse current force is calculated by the formula in BS 6349 and longitudinal current force is calculated by the formula in Mooring Equipment Guidelines (OCIMF-MEG3—2008).