With the application of high strain dynamic pile test on large diameter super-long PHC piles of major project abroad,the pile defect types are concluded by comparing the PDA test results of the end of drive and restrike.The defects are found out at the pile head,pile body,the joint position and the bottom of pile etc.New proposals about the large diameter super-long PHC pile integrity judgment are put forward that the integrity coefficient of pile is not the only criterion.