It is important to assess reasonably the design through capacity of general berth for maximizing the port production efficiency.Based on two designs through capacity calculation formulae of the general berth in the Design Code of General Layout for Sea Ports,we analyze two calculation formulaes’ differences and their transformation relationships,and put forward two calculation methods,i.e.the calculation method of artificial decomposition work days or the berth utilization ratio and the calculation method of the proportional factor of the throughput.Example calculation results of a general berth project in north China shows that the two calculation formulaes in the code are practical,and the designs through capacity according to the two calculation methods are basically consistent.