The theme of this article is to study the relationship of natuonal policy and regional development in Hua-lien. Based on the case study of Taroko National Park,this paper tried to investigate the role that the National Park had played and the results it had got, while the national policies for regional development were launched. The paper studied some development projects for Hua-lien province, such as hydraulic electricity power plant,and mining issues. Through the interaction process of those polices, this paper intends to present a picture of the relationship. And the findings are first, under the goal of the National Park, the execution of those development projects has been restricted. However, the aim for the environmental protection through Taroko seems incomplete, especially when the regional and national policies have collided with each other at the same time. Then we may conclude that at this moment, the projects of regional environmental protection have to give the priority to the economic policies for national development. However, the central role of power and policy elites must not be neglected. In sum, this paper contributed an evidence for understanding the two line struggles between environmental protection vs. economic development, and national vs. regional developments in modern Taiwan history.