Abstract: Due to the advantages of intuitive defects image, high reliability for flaw identification and inspection precision for defect size, phased array ultrasonic nondestructive testing technology has been widely applied in industry in recent years. To meet the increasing requirements of industry application, related agencies have worked on the standard development. And some of standards have been implemented. This paper mainly compared the standard system and contents of main international standards. It can provide references for the standard development of our country.