Abstract: Introducing the concept of function into traditional object Petri net, a new evaluation model of ecosystem vulnerability named object-function Petri net model (OFPNEM) was put forward. The facilitating and suppressing factors of the ecosystem degradation were analyzed in this evaluation model. Trigger conditions of vulnerability were depicted as transitions and the state of ecosystem in the process of change were depicted as object places. Logical causality of environmental degradation could be represented directly. Furthermore, evaluation model on the vulnerability of mining area ecosystem based on object-function Petri net was proposed. Through object-function Petri net, combining the rules of model, a reasoning algorithm was posed. The effectiveness of the algorithm was verified by experiment. Dynamic changes in the process of ecosystem degradation were taken into evaluation so that a closer ecosystem description to reality could be made.

Key words: object-function, Petri net, vulnerability evaluation modeling, dynamic changes