Abstract: Defects and their topologies and structure details can be visualized by using non-destructive testing and evaluation(NDTE) based on visual imaging techniques.So far,a diverse of visual imaging techniques have developed for the purposes of NDTE.The powerful one of them is ultrasonic imaging technique,which has been applied in practical industries.Ultrasonic imaging methods based on B-,C-,T-scan and 3D projection imaging provide the opportunities to see bulk structure details and quantitative NDTE of materials.It can be employed to evaluation of composites and adhesive bonding components both in Lab and in-service.Typical applications and results in evaluation of composites and welding have been presented in this paper too.