Petri net is an important tool to model asynchronous and concurrent system. It is applied to VLSI more and more. Obtaining corresponding logic circuit from Petri net model of the system directly is the research goal of many scholars. Petri网是异步并发系统建模的重要工具,正越来越多地被应用在超大规模集成电路之中,从系统的Petri网模型直接获得相应的逻辑电路是许多学者研究的目标。