This report focuses on the online public opinion in Taiwan in the year of 2015. Through content observation and automatic sematic technique to the big data，we analyzed the theme distribution and subject consists of the public opinion，and also compared the influence of media，opinion leaders，and politicians. The relationship between Taiwan and mainland was paid particular attention to，especially the reaction of the online public opinion to the “Xi and Ma’s Meeting”. Lastly，characters of the online public opinion in Taiwan was made clear and the new development and trends of the online public opinion in Taiwan was discussed.