By examining the changes of the utilization and spatial allocation of the living space in Japanese-style houses, the analysis indicates that the houses were extended or remodeled by Taiwanese residents to adapt them to not only the effect of modernization but also to the Taiwanese lifestyle. In addition, since the style of Taiwanese houses have some differences from the Japanese's, some places are likely to be extended or remodeled, but others are actually preserved. Thus it means some Taiwanese residents decide to preserve the characteristics of Japanese-style houses and adjust their lifestyle in compatibility with the spatial allocation. Furthermore, analysis results also indicate that the contents of the transformation of the living space in Japanese-style houses changed according to the length of the duration that new Taiwanese residents lived in the houses.