Abstract: Material transportation is a highly intricate logistics process on large naval ships, where the transportation time is affected by the transportation route, alleyway, and transporting equipment, etc. In this paper, a method of analytic calculation of the complex material transportation bottleneck, based on opera-tional researches, is proposed. The route is first divided into several sections, and the bottleneck is deter-mined after calculating and analyzing the flow and time of transportation in each section. The alleyway and the equipment on the bottleneck should be adjusted accordingly, and each section of the route could be op-timized to the equipoise principle. In brief, the proposed method can locate bottlenecks through relative simple calculation when the material is transported on several complex routes at same time, and the ratio-nality of the route & alleyway & equipment can be judged and modified to optimize the overall transporta-tion project. It is seen that the time and effort in the simulation calculation is reduced, and further modifica-tion of arrangement and equipment can be avoided.