On October 11, 2000, the Central Committee of CPC approved the proposal of the Tenth Five-Year Plan and formally put forward the strategy of the Western Region Development. Such strategy was not only essential to the PRC's economic development, national solidarity and social stability, but also to its balanced regional development and the common prosperity, its ultimate goal. Moreover, the implementation of overall plan for the development of western region will realize the strategic goal of Deng's three-step strategy. Although there has been abundant material concerning western development, most of them focused on the description of how it developed and the introduction of its strategic goal, mission, policies and measures. Instead, this paper tries to explain the western region development and inductively analysis the social development model of the western region development by borrowing the concept of social development. In this study, the authors separated the paper into seven parts: In addition to describing its strategic order, objective and main tasks, the framework of the western region development has also been introduced and illustrated. By focusing on the evaluation of its efforts since the western region development was put into practice four years ago, this paper tries to come up with an objective assessment. Furthermore, through the analysis of how it worked, the authors could infer a specific model connected with the western region development-taking balanced development as its theoretical basis, individual as its subjects, and all-around development of a well-off society as its prime task. Does this model work as PRC's own western characteristics? The authors argue that due to its short-term application, advanced observation is still needed to make a final adjustment.