Abstract:Abstract ：Due to the environmental and human factors of transmission lines, transmission stability and power supply reliability are weakened to a certain extent. In most studies, the effects of individual factors such as wind, lightning, and birds on transmission lines were analyzed separately. In order to explore the combined effects of multiple factors on the operation status of transmission lines, a transmission line operation status evaluation model and an operation status prediction model were established. Firstly, by analyzing the influencing factors of transmission line operation, six key influencing factors were identified; Build a transmission line operation status evaluation model based on Markov chain and least squares support vector machine algorithm, and search for the risk level of key influencing factors on the transmission line; Finally, based on Bayesian network, a prediction model of transmission line operation state is established, and key influencing factors are input to verify the model. The results indicate that the prediction accuracy is 85.25%, and the prediction model has certain practicality.