Discusses the application of ultra-acoustic detection technique in the adhesion by halved joint between metallic and nonmetallic barrel workpieces.The adhesion area in circumferential direction of the detected workpieces can be plotted on a CRT screen thus enabling a prediction as to whether adhesion strength is qulifiable.It has been shown that,when the rate of non-qualified products is about 5%,the technique gives a rate of misinformation of less than 0.5%.