This case study tries to prove that the system of National Park would function positively to the conservation of natural resources. It will firstly trace the brief history of Yangminshan National Park and then list all the evidence about how the system works to regulate human cultivations and activities of the economic development under the implementation of National Park Law and Regulations. The Yangminshan case demonstrates that human environment can benefit from an appropriate policy. In addition, this case also shows that the system of National Park can be regarded as critical criteria for both the natural conservation in Northern Taiwan and ecologically sustainable development.