Petri ant is employed to analyze the coneurrent system and to make it into a model. But the faculty of Petri net is limited. Therefore in this thesis a Petri net of which restricted edge and capacity are extended is proposed in order to improve the modeling faculty. This paper also proves that the algorism which I have designed, can be transformed into a general Petri net for improving the analytic power of the expanded Petri net. Through explanatory examples i have also shown the usefulness of the algorism.