Abstract
In Europe and North America, users of Car Sharing become increasing dramatically from the beginning of 2000. However, there is few car sharing business in Japan because not only of the legal constraints regarding parking spaces and also of incomplete in its system architecture. Therefore there is no information about the process of spread of car sharing services. This study has two purposes; the first one is to build an operational simulation system in consideration of a spread process of carsharing. The second is to analyze the effect for process of spread by various changes into simulation system.