本研究以Schwartz與Moon（2000）提出的實質選擇權模型為基礎，再引入模糊理論，建立模糊實質選擇權模型。太陽能產業的益通為樣本公司，進行參數估計，並使用蒙地卡羅模擬，估計益通的合理價值。經過敏感度分析更進一步瞭解，影響公司價值最重要的因子為期初收入成長率與成本。 將本模型應用到其他電子產業，發現公司的股價常有遭到市場高估或低估，而偏離真實價值的情形發生。因此本研究建立一套投資策略，並參考模型估計的合理價格為投資的依據，希望能夠賺取價差。策略模擬的結果，獲利能力明顯優於長期持有的方式，也證明了本模型的實用性。 / In this study, we use the real option model from Schwartz and Moon (2000) as the basis, and then combine it with fuzzy theory to create Fuzzy Real Option Model. This study takes one company in solar power industry － E-TON as the sample company to conduct the parameter estimation. We also adopt the Monte Carlo Simulation method to assess the reasonable value of E-TON. After the sensitivity analysis, the results show that initial rate of growth in revenues and cost are the most important factors which influenced on the value of a company. Furthermore, we apply this model to other companies in electronics industry and discover that the stock prices are often overvalued or undervalued by the market. Therefore, we develop a set of investment strategies for people who want to make profits from the difference of prices. The result of strategic simulation shows that profit is apparently better than the way of buying and holding, and it proves the practicability of this model as well.