The one of Japanese traditional Town-houses called "Nagaya" is characterized by the stores and houses on a street of pre-Modern and Modern Osaka City exceedingly. Those have repeated enlargement and renovation at the complicated modernized situation in Osaka, and yet some of them have continued to exist. The purpose of this study is to extract mechanism of change from chronological simulation based on 'Tipologia Edilizia', and to recognize necessary conditions of continuation. As a result, We found that the owner and residents have continued the maintenance based on weak traditional system in spite of under the situation of inevitable modenization.
