Abstract: To analyze the stress level of buried defective polyethylene pipeline under the combined load of temperature and surface, the pipe-soil interaction model was established by using ABAQUS, and the combined load of temperature and surface was realized through thermodynamic analysis. The effects of temperature and surface loads on the in-service pipeline was analyzed, and the influences of buried depth, surface load position, elastic modulus of soil, friction coefficient of pipe-soil on the maximum stress was discussed. The results indicated that the effect of temperature load on the stress of buried polyethylene pipeline could not be ignored under the working pressure required by the code. However, the maximum stress of the pipeline was finally located in the direction of 3 oclock in the inner wall under the influence of internal pressure and temperature load. This result was consistent with the final position law of the intact pipeline, in which the defect in the 3 oclock direction of cross section was most prone to failure. The effect of the buried depth of pipeline and elastic modulus of soil was much greater than that of the friction coefficient of pipe soil and offset distance of occupation pressure position.