Abstract: In nuclear and aerospace industry, the widely used precision tubes and bars needed to be inspected in detail for tiny defects and dimension of wall-thickness and diameter. An automatic examination system is designed for this purpose which is with the function of the inspection and measurement. The system is composed of ultrasonic testing sub-system for inspecting longitudinal and circumferential defects, and ultrasonic measurement sub-system and eddy-current testing sub-system. The defects which could be found are longitudinal and circumferential ID and OD in pipes with ultrasound shear wave, and internal defects in bars with ultrasound longitudinal wave, and longitudinal and circumferential defects in bars with ultrasound shear wave. The ultrasonic measurement sub-system could inspect the wall-thickness of pipes and the diameter and ellipticity of pipes and bars. With bobbin coil, the defects and pollution in pipes and bars could be inspected, and the noise signal of material could be inspected also. With the rotating point probes, higher sensitivity for defect eddy-current testing is acquired. By using axial encoders and circumferential encoders, the display in all sub-system has the modes of strip chart recorder, B-scan and C-scan, respectively, which could be used for analyzing and measuring the imperfects. Experimental results show that the system has high sensitivity, resolution and reliability for nondestructive examination of precision tubes and bars.