In a traditional method to clarify causes of traffic accidents by using tapes, there appeared its limitation of reliability on the inspection of accident. With only limitted number of people and equipments, it is almost impossible to inspect and examine the causes of traffic accidents while not resulting a traffic complexity and its impediment. In this paper, as an approach to such problems, a rationalization in treatment of the traffic accidents was tried to be found, as accurately measuring 3-dimensional co-ordinates between the needed points by the stereo-models pictured by a stereo-camera, then composing some plane figures which show places and vehicles concerning the accidents, abstracting some needed informations from the resultants, and supplementing to solve problems on the pre-existing method, and sometimes when needed, enabling to treat the troubled points by reappearing those points.