In this paper, we present a new formal Method for the Verification of a Multi agents Systems (MAS). We explain and applied a new method based on agents called Agents Petri Nets (APN). Our model describes each entity to model the system and verify the state of the agent and its behavior. This method use, mainly, the property of Petri Nets as deadline, state home, conflict, etc.. Therefore we use a formalism having a mathematical definition in order to verify some property of the interactive systems. To validate our contribution, we will deal with real example of a Multi agents System.