Abstract: The CIVA simulation software is composed of three parts-UT, ET and X-rays, and the UT module can be divided into Beam Simulation and Defect Response. This software can support many types of specimen, different inspection methods and a variety of probes, and it can also guide us to make an inspection technique. Because the ultrasonic testing is very complex, so this paper will introduce some successful cases of CIVA application in this realm.