By analyzing the design method of channel depth in domestic and foreign specifications,we study the significance of UKC (under keel clearance) parameter in different specifications,carry out systematic contrast and difference analysis of the parameter values,propose the applicable scope and value suggestions of specifications,and apply them in some project cases.The results show that under some conditions,the calculation results of UKC values in the specifications are verified and checked mutually,and the accuracy and rationality of the design of the channel depth can be improved.The achievement can provide references for the similar projects.