On one hand, the increasing openness of the port with the economic globalization has brought opportunities to the port; on the other hand, the port has been exposed to increasingly fierce competition. In the fierce competition, providing high-quality and cheap handling service for ships is the key driving force to promote the development of the port. The cost covering handling services is composed by fees covered handling mechanical services and unpaid waiting expenses refer to the board-to-bank loading and unloading. The cost covers handling services. The former fees increased in the step with the handling efficiency and quantity, the latter expenses declined with the ones stated before. Many models based on queuing theory were proposed in order to determine the optimal handling efficiency and the number of handling machines so that the lowest total cost of handling services can be achieved. The common one-dimensional model Ⅰ that is used to solve the optimal handling efficiency, and the common one- dimensional model Ⅱ that is used to solve the optimum number of handling machinery. Based on the model Ⅰ and model Ⅱ, the paper puts forward a two-dimensional model Ⅲ that is used to solve the optimal handling efficiency and the optimum number of handling machinery. The study also solves the improved model Ⅲ through Delphi programming. The author knows that this model still has many shortcomings. In the future study, the model will be further improved to get better handling service system construction scheme.