With the rapid development of social economy and the industrial restructuring，the flexibility demands in the process of port overall plan compilation，implementation and management are increased.It is necessary to define the rigidity and flexible contents，and promote the overall plan thought implementation-oriented，management-oriented and “combination of rigidity and flexible”.Based on the analysis of the causes of the “rigidity-flexible imbalance” in the port overall plan，the paper classifies the plan indicators based on the current port overall plan formulation and management system，then the rigidity and flexibility contents of the port overall are clarified.And further，taking the “Ningbo Zhoushan Port overall plan” as an example，the paper verifies and explores the plan formulation concept of “combination of rigidity and flexibility” to enlighten the relevant plans.