In order to solve the problem that there are many factors affecting the safety of guyed towers and the safety evaluation is greatly influenced by subjectivity,a safety evaluation method for guyed tower based on Bayesian network is proposed.This method constructs a Bayesian network model based on the fault tree,and u-ses the actual detection data of guyed tower to obtain the root node fault state and its probability,which over-comes the difficulty in obtaining the root node fault probability.The fault probability calculation,disaster factor identification and fault diagnosis of guyed tower are realized,and the safety analysis of guyed tower is realized through causal reasoning of Bayesian network.The example analysis shows that the safety assessment method based on Bayesian network overcomes the problem of subjectivity of the traditional comprehensive evaluation method,and the evaluation results are consistent with the operation conditions,which can be used as a deci-sion-making tool for the safety assessment of the guyed tower.