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对于快递企业而言，快递过程总是与快捷运输工具的使用紧密联系的。因此，获取相适应的运力资源是其生存发展的基础。现实中，没有一家快递企业可以做到运力资源的完全内部化。这也就表明，快递企业与掌握各种运力资源的专业运输企业之间的合作似乎是必须的。社会经济系统中，存在大量的不确定性，且决策主体是有限理性的。快递企业与专业运输企业之间相互交往的规则或制度安排不是唯一的。本文试图用演化博弈模型来分析快递企业和专业运输企业的交互演进的过程中，通过对众多的参与者（多家快递企业和多家专业运输企业）的战略选择和调整的过程的动态分析，指出快递企业——专业运输企业动态合作过程的存在两个局部均衡点，也就是说，快递企业和专业运输企业合作模式的博弈有两个演进方向，既可以采取股权合作策略，也可以采取契约合作策略，这两种策略都是演化稳定策略。

Analysis on the Stability of Cooperative Strategy between Express Company and Specialized Transportation Enterprise

In the process of transportation, express companies must use one or diversified express transportation modes which are important traffic capacity resource need be input. However, as a matter of fact, there are no express companies, which can completely internalize all the traffic capacity resources. That is to say, it is necessary for express companies to cooperate with specialized transportation enterprises with varied traffic capacity resources. Since abundant uncertainty exists in realistic social economic system and decision-making bodies are with bounded ration, there is no one and only rule or institutional arrangement for the transaction relationship between express companies and specialized transportation enterprise. This paper has used evolutionary game model to analyze the evolutionary process of interactive game between express companies and specialized transportation enterprise. After dynamic studying on the process in which the parties (numerous express companies and specialized transportation enterprises) carry out strategic choice and adjustment, we can get the dynamic evolutionary stable strategy for express companies and specialized transportation enterprise based on evolutionary game model, and find out the stable equilibrium point. In the end, we can know that cooperation game between express companies and specialized transportation enterprise would evolve in two dimensions: one is stock cooperation strategy and the other is contract cooperation strategy. Both are evolutionary stable strategy, which can be verified by the strategy choices of enterprises in our realistic economy.