Abstract: A binocular camera information system is used to track and measure a moving object in real time in 3D space. As the moving object goes out of the field of view,pan&tilt of cameras is turned to search the object.Furthermore,an arithmetic without recalibration for moving object distance measuring is studied,in the condition of camera moving.Herein adaptive background modelling algorithm and CamShift algorithm are used respectively to identify and track moving objects. Experimental results are presented to demonstrate that the proposed method can track the moving object effectively and get its 3D location accurately.