Abstract: Because the adhesion state of special specimens (top surface is circularity and the bottom is bevel) can not be tested by ordinary ultrasonic measurement, a set of experiment equipment is designed in this paper for special specimens. According to the characteristic of specimens, the ultrasonic was incident the surface of specimens slantways by changing the angle of incidence. The experiment and the processing result indicated that the result gained by slantwise incidence was more precise than by traditional vertical incidence. Many experiment results proved that the measurement for adhesion state of special specimens was practical and valid.