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分析、评价过程的性能是改进和优化过程的重要依据。而执行时间是业务过程执行效率的一个重要度量。提出了一种基于Petri网的对工作流平均执行时间的路径--关键路径的优化方法，并详细阐述四种流程结构的时间性能分析算法。最后，给出工作流优化系统 JXWorkflow的具体实例分析，通过对结果的比对分析，从而验证方法的有效性。“,”Performance of analysis and evaluation is an important basis for the improvement and optimization of process. While execution time is an important measure of business process exectuion efficency. This paper presents the cirtical path optimization method which is the workflow execution time on average based on Petri net, and elaborates time performance of four kind s of process structure analysis algorithm in detail. Finally, gives the analysis of specific example of workflow optimization system-JXWorkflow , which verifies the effectiveness of the method by comparing the result of analysis .