The orbicular image is very familiar in images progressing. To detecting orbicular images, many parameters were got by center coordinates. The algorithm of measuring center position based on digital image processing is proposed in this paper. First, the basic circle recognition's algorithm is analyzed in the same time, for double images, the method of separation delimiter is analyzed mainly. Last, an integrated measurement scheme and realization approach with computer is presented. Simultaneously, based on experimental data, the application range of all kinds of detecting algorithm is analyzed, the result show that this method proposed is effective and universal.