Street Boundaries are often subject to be changed due to urban planning and transformations in old town area. The three inter-relationships among street boundaries, plot boundaries and building interface influences the rights of public-private definition directly. This issue/ problem of boundaries affected the implementation of the human-orientated (pedestrianised sidewalk) policy in Taiwan's historic urban area in the last 20 years. This paper applies urban morphology and typology to analyse the transformations and conflicts among the three boundaries in the old town of Chung-Li. Recommendation is also raised for future implementations.