Circular target has been widely used in object recognition and localization, and its localization precision largely determines the precision of the 3D measurement system. In order to eliminate the eccentricity error generated by perspective projection transformation and improve the location precision of circular target, the eccentricity error correction of circles target has been researched, and a correction method based on the existing derivation of spatial projection is proposed. Firstly, through perspective projection transformation, the concentric circle is changed to two different ellipses with separate centers. According to the centers of two ellipses and the radius of concentric circle, the actual position of the center is calculated. Then, a concentric circle projection simulation experiment is carried out, and the relationships between eccentricity error and radius of circle as well as the rotation angle are analyzed according to the result of circle central location. Finally, a monitor is used as object plane to display the concentric circles with different parameters. And together with a camera, they constitute the experiment system to evaluate the measurement precision of circle center. The results show that this method can accurately obtain the actual projection point of concentric circular target, and the average back-projection error of the calibrated camera can be reduced to 50% after correction. Compared with previous verification methods using calibration board, the proposed method using monitor to verify the concentric circle location precision has better flexibility and practicality in operation.