Two concerns are identified on the effort toward sustainable development. One is about the geographical scale of implementation and the other is the measurement of sustainability. In this paper, a system model of Ping-Ding community, Yang-Ming Shan National park, is constructed to analyze the sustainability of community development based on the concept of 'global thinking, local action.' The model of Ping-Ding community is built by Sensitivity Model on a system thinking which is different from the traditional index-based approach.