This paper presents a project schedule management model based on Place Timing Petri nets, by analyzing the shortcomings of existing models based on timed Petri nets or time Petri nets. The schedule management model based on Place Timing Petri net has the feature of global clock, and not only reflects time parameters of process, but also able to model time constraints of external resources.%通过分析现有时延Petri网和时间Petri网在项目进度管理仿真模型的不足，提出基于库所时间约束Petri网的项目进度管理模型，该模型具备全局时钟特性，不仅能体现工序自身时间参数，同时能对外部资源等工序外延时间约束进行建模。实例仿真结果表明该模型的有效性。
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