According to the gathering of people, economic concentration and a wide range of social influence. It has become a key target for terrorist attacks. While analyzing the typical events of exhibition terrorist attacks, this paper focuses on the main risk factors of terrorist attacks in exhibition activities, and focuses on the main risk factors of terrorist attacks in exhibition activities from three dimensions: external terrorist threats, security vulnerability of exhibitions and the severity of the harmful consequences of terrorist attacks, and then, on this basis, constructs a risk assessment index system for terrorist attacks in exhibition activities, and uses Bayesian network to model the risk of terrorist attacks in exhibitions. For the conditional probability distribution in the Bayesian network model, the qualitative method based on expert fuzzy evaluation and the quantitative method of literature research is used to determine, and the exhibition fuzzy Bayesian terrorist attack risk assessment model combining qualitative and quantitative methods is constructed. Finally, we will analyze the problems existing in China current exhibition activities to prevent the risk of terrorist attacks and propose relevant counter-terrorism countermeasures.