Within these years, in order to effectively arrange the limited resource that the government has owned and been able to allocate, a detailed financial plan and a well-structured evaluation system for any project is essential. Normally the most research topics issued are related to the economic effect of natural resources. In Taiwan, the article about analyzing the economic effect about the tour schemes proposed for the development of National Scenic Area is few and only at the beginning stage and the cause mainly is because of the common property of such schemes, i.e. the involvement of different departments needed. At this situation, effected by the different control froces from a varity of government departments and varied industry structures and developing progress in different areas, it is difficult to clarify and analyze the achievement for each department. Owing to this character, the economic effect related to such development schemes is difficult to conclude and it is even harder to evaluate whether or not the economic benefit is definitely resulted from the improving projects. The research topic is going to comprehend the economic effect caused by the medium-range scheme launched by National Scenic Areas, then is able to propose some feasible items to evaluate the economic effect and collect the figures the Cost-Efficiency Evaluation relaed to the effect. As to the intangible benefit, it is assessed by the Contingent Valuation Method (CVM). The study takes the case of Penghu National Scenic Area to predict the economic effect between 2008 to 2011. From the research, it shows that the figure of Willing To Pay (WPA) among the tourists already visited the Penghu National Scenic Area is NT$6,943 and within 2008 and 2011, after the development implemented, the amount is going to raise to NT$9,638. Based on this raise, the economic revenue would be NT$415,691,000 caculated from the Prediction equation in 2008, NT$428,984,000 in 2009, NT$442,397,000 in 2010 and NT$ 455,933,000 in 2011. Within 10 year of available analytic fixed number of years, the 4-year Net Present Value¡]NPV¡^ ¡]valuta of 2008 year ¡^ will be NT$1,766,586,000 based on the discount rate at 2% and the 4 year Benefit-Cost Ratio, B/C ratio is 3.05>1. From this result, the 2008-2011 development plan itself has demostrated its economic feasibility.