The invention discloses a method for quantifying the influence of malicious attacks on an information physical power system, and the method comprises the steps: quantifying bugs of all nodes of the system, and constructing a system bug quantification matrix; analyzing attack characteristics, constructing an attack behavior model according to the system vulnerability quantification matrix, and forming an attack behavior matrix; constructing a system state transition probability matrix under the attack according to the system vulnerability quantization matrix and the attack behavior matrix; andcalculating the probability of successfully attacking the target according to the system state transition probability matrix, and analyzing the influence on the system. The invention further disclosesa corresponding system. The method comprises the steps of quantifying system node vulnerabilities, constructing a system vulnerability quantification matrix, fully analyzing attack characteristics, constructing an attack behavior matrix, constructing a system state transition probability matrix based on the system vulnerability quantification matrix and the attack behavior matrix, calculating thesuccess probability of malicious attacks, and quantifying the influence of the malicious attacks on the information physical power system.