Abstract: The traditional phased array testing technology can not meet the requirements. In this article, based on phased array ultrasonic testing technology, studies and analyses were firstly made on the principle of creeping wave technology to compare creeping wave effect between different types of dual array PAUT probe and to analyze creeping wave effect by parameters of PAUT probe. It is hoped to solve the problem effectively for the girth weld inspection of stainless steel pipe by phased array ultrasonic creeping wave.