Abstract: The part flexible material flow system is modeled with object-oriented PetriNet combined with object-oriented analysis and advice expert system．In addition‚the approach of realizing scheduling strategies based on model is also introduced and the corresponding program is developed．In the end‚the simulation experiment is given．The result shows that the model is simple in structure‚the method of modeling is makes it easy to combine expert system with PetriNet and to realize the function of analysis and advice expert system for material flow system． 

Key words: flexible material flow system, scheduling rule, object-oriented, PetriNet, expert system