The utility model relates to a strand anchor cup internal thread district ultrasonic phased array detects and uses test block, including two a set of test blocks, in every test block and strand anchorcup thread zone (1) material, specification are the same, distribute on interior thread zone (1) threaded (8), make the crackle in interior thread zone (1) of every test block, the crackle contains the transverse crack and erects the crackle, and the transverse crack is along the crackle of screw thread (8) direction, erects the crackle that the crackle is perpendicular to screw thread (8), set up the transverse crack that a plurality of the degree of depth scale up in the test block, set up the perpendicular crackle that a plurality of the degree of depth scale up in another test block. Theutility model discloses having guaranteed detectivity, having improved detection quality, thread zone ultrasonic phased array detected a no reference block difficult problem in fundamentally had solved strand anchor cup, adopt material, the specification the same with strand anchor cup to complete, and detection quality 0 was simple, detection quality 1.