We present the calculation formula of berthing energy in unified facilities criteria，compare the similarities and differences of selection of design parameters and calculation results in unified facilities criteria（UFC），BSI standard and Chinese standard，and further study the eccentricity coefficient Ce and virtual mass coefficient Cm. The results show that UFC considers the influence of the under keel relative clearance on berthing energy in Cm，and the calculation result of Cm in UFC is similar to that in ship model test. The berthing energy in UFC is higher than that in BSI standard，while it is the lowest in Chinese standard. Ce and Cm are basically constants in different ship types，and they vary little in relation to tonnages.