Abstract: Compared with camera calibration methods，this paper introduces a camera calibration method based on vanishing points.The method is based on corresponding subject in B-dual-space geometry rooted in computational geometry.The paper uses the relationship about point，line and plane in chessboard image，combines the improved detection and computing technique about corner points.Firstly computing the x-axis and y-axis focuses of the camera’s inner parameters，secondly computing the corresponding parameters combined with optimization，finally acquiring the whole camera’s inner parameters.The method has the merits of simpleness and high precision in experimentation.