This study adopts the method of literary analysis. It investigates whether there are some useful ideas we can learn from Pope Francis' ecological encyclical Laudato Si'. There are four parts in this study: First, it discusses the backgrounds of Pope Francis' ecological encyclical; Second, it explores the features of the ecological encyclical; Third, it analyzes and criticizes the ecological encyclical; Finally, it reflects on the ecological issues in Taiwan in light of the ecological encyclical.