Abstract: To solve the problem of RFID system breakdown risk caused by frequent RFID system attacks， this paper proposes a RFID system security analysis model based on hierarchical generalized stochastic Petri net. The model uses the existing knowledge reserve to simulate the real RFID virtual environment， accurately and effectively deduces the attack process in the RFID system， and quantifies the risk of the RFID system. Firstly， the RFID attacker model is constructed using the information of attack hierarchy，attack authority and permission-based attacks. Secondly， the description of the attacker's behavior is modeled  and described its impact on the RFID system state. Finally， based on the constructed model， the attack probability， weak nodes and other aspects of the RFID system are assessed. The experimental results show that the proposed model can effectively evaluate the risk of RFID system， and greatly reduce the complexity of evaluation time.

Key words: stochastic Petri net, safety assessment, time complexity, combination of attack