In order to improve the level of camera automatic calibration, a general algorithm for matching corners and their world coordinate is proposed on account of kinds of board. Major factors of influence on corners’ match are analyzed, lens distortion and geometric deformable caused by projection transformation. The algorithm searches the best projected angle with the “sum of Interval variance”. The algorithm chooses the style of interval partition automatically and corners are classified twice. The capability for resisting geometric deformable and projection transformation is testified through simulation. That the algorithm can match corners accurately and steadily, which is proved in real experiment. The algorithm as an independent module has been used in solution and improves the automatic level of calibration obviously.