In order to realize traffic accident reconstruction of passenger car effectively,on the basis of the existing camera calibration method,a new camera calibration method based on motion orienta-tion was proposed. The actual position and orientation relationship of the camera was determined ac-cording to the road conditions and the size of the passenger car. We recorded coordinates of the cam-era in the world coordinate system when the camera has any motion such as horizontal rotation ,or lev-el shift,or tilts a certain angle,which helps to determine the camera parameters. The actual size can be obtained by mathematical model of camera imaging based on the feature points’setting in the world coordinate system. The reliability of the set of camera motion parameters was verified by inverse meth-od. This method was applied in actual scene to test error. When the heights of the camera center are 900 mm and 1 700 mm,the body of the passenger car in the scene is shooed with 0° and 30° respec-tively,and then the actual information of the image feature points in the accident scene can be ob-tained,by date extraction and three-dimensional conversion. The experimental result shows that the testing error is less than 5% and can meet the requirement of accident field measurement.%为了更好地对乘用车道路交通事故现场进行三维再现，在现有相机标定方法的基础上，运用相机成像原理提出了一种新的基于运动方位的相机标定方法。根据道路条件及车体尺寸确定了相机的实际拍摄位置和方向关系；在事故现场设置特征点，根据相机成像原理及摄影定理求解相机参数。将相机同心固定放置在可水平旋转的平台支架上，支架的高度可调节，相机拍摄角度可倾斜，在确定相机相对于世界坐标系的具体位置及位置变化情况的基础上对事故现场进行拍摄。对相机分别进行1次水平旋转、1次平移运动和角度倾斜，记录相机每次运动后在世界坐标系中的坐标，依据坐标辅助计算确定相机的参数。应用反推法检验了相机运动参数设定的可靠性。对实际现场应用此方法，误差分析结果表明：试验误差小于5%，能满足目前事故现场测量的要求。
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