The ceramic inserting hole and the outer core of coaxiality error is the most important index to judge the ceramic inserting core quality, seeking the coaxiality detection method is accurate and efficient ceramic ferrule production industry for many years to pursue the goal. Aiming at the ceramic ferrule concentricity detection problem, a new method of coaxial Charge Coupled Device (CCD) detection and image measurement is put forward based on the combination of measurement, and the measuring system is constructed. The first system to insert the external cylindrical surface as the benchmark by rotating a certain angle, the inner hole image acquisition, according to the class of inflection point algorithm to extract the inner hole edge of the image contour, then the least square method (LSM) was used to fit the inner hole of the circular curve, for different angle corresponding to the center position, multiple circle circumcircle diameter was inserted core coaxial error. Experiments show that, this method is simple and practical, to meet the requirement of precision in core has high detection efficiency and low false positive rate.