Abstract: Nondestructive Test technique is the important measure of doing supervision and diagnosis of spherical tank engineering quality, and is significant for the supervision of petrochemical engineering quality. This paper introduces the application of Nondestructive Test technique in engineering quality supervision of spherical tank, by combining the common example of spherical tank in size of 400 m3, this paper discusses the NDT technique and detailed processes or testing positions and steps, etc, for the purpose of construction quality in engineering quality supervision.