Abstract: As a high technology method of nondestructive testing, phased array ultrasonic testing has drawn peoples attention extensively in recent years. Firstly, the basic theory was introduced, and the general research situation of the phased array ultrasonic testing at home and abroad was stated in detail. Secondly, combined with some advantages of the phased array ultrasonic testing, the application in the weld was introduced. Finally, as to the demands of development, this article looked into the good prospect of phased array ultrasonic testing in the remanufacture.