The integrated energy information physical system plays a vital role in the modern energy network

and enhancing its ability to withstand cyberattacks is crucial to ensure the reliability and security of the energy supply. Based on the law of entropy increase

this paper presents an entropy modeling method for the integrated energy information physical system under network attack. Firstly

the physical information flow coupling calculation model of the integrated energy information physical system is established. Then

a calculation model for information attack and a system disturbed by a network attack is constructed

and an evaluation index for the physical impact of network attacks based on power flow entropy is proposed. Finally

the influence of different types of information and physical attack modes on the entropy distribution of the integrated energy information physical system is analyzed through a numerical example

which provides a tool for quantifying the unavailability of energy after the attack

enriching the entropy state theory of the traditional integrated energy system

and providing a new perspective and method for the security protection of the integrated energy information physical system in the future.