Abstract: For adapting business needs,looking for optimal path of behavior execution in business process under beha-vior constraints has a certain practical significance．The existing proposed methods are to search the optimal path by optimization algorithms or behavior analysis on the basis of static analysis,ignoring the impact of behavioral constraints on the effectiveness of the execution behavior,thus have some limitations．On the basis of the existing methods,using the ordering relation of Petri nets behavior profile to describe constraints and determine behavioral effective ranges, this paper proposed a method of optimal path selection in business process based on modal Petri net branching effective ranges．This method uses behavioral effective ranges to substitute for the existing fixed value,so as to better describe behavior constraints of business processes and effective behavior under constraints．Finally,a specific case analysis was given out,which shows the proposed method is effective．

Key words: Behavioral profile,Branching effective range,Behavior constraints,Optimal path