Abstract: low strain measurement method,static load test and intra-hole imaging method are briefly introduced about The principle、advantages and disadvantages.When the static load bearing capacity of multi-section PHC pipe piles differs greatly from the prediction results of survey parameters and there are doubts about the deep defects of the pipe pile,the lowstrain method cannot be clarified,and the intra-hole imaging method can be used to understand the depth and extent of defects to improve the reliability of the test results and explained them through engineering examples.Hope to provide reference for the design and defect processing of similar projects.