Abstract: In order to evaluate the in-service pipelines from the point of view of quantitative analysis, this paper establishes a set of non-destructive measurement technology of on-line stress state in oil and gas pipelines based on ultrasonic LCR wave on-line stress testing device. And the engineering site pipeline maintenance evaluation method of “stress initial measurement and evaluation-emergency repair measures and suggestion-stress retest evaluation-pipeline periodic inspection” for the deformation section caused by geological disaster is built. In this paper, a preliminary field engineering trial of the method has been carried out. The results show that this method is an effective method to evaluate the on-line stress state of the deformed pipe sections caused by geological disasters, which provides a basis for the quantitative evaluation of the safety margin and repair quality of the deformed pipe sections, as well as technical support for the later maintenance of the deformed pipe sections.