Abstract: Ultrasonic phased array technology is often used in engineering application for high detection efficiency and high sensitivity. But for the detection of complex surface material, since the conventional phased array probe can not fit closely with the material it is therefore difficult for one to detect the material. This paper describes a flexible phased array probe that is available for detection of irregular surface & corner part of the specimen by direct contact method，and furthermore through improving the performance of the flexible phased array probe a new flexible phased array probe was developed. Through the performance comparison with the old flexible phased array probe, it is demonstrated that the new flexible phased array probe possesses high sensitivity and high resolution of 0.1 mm. Several practical engineering applications of the new flexible phased array probe are presented. The more engineering application of flexible phased array probe is expected.