Rational investors will consider the expected return and risk when making decisions of investment.Traditionally, the return and risk exist a positive trade-off relationship of: the higher expected return investors required, the higher risks they would take. In the behavioral finance literature, the sentiment of investor affects asset pricing, and asset prices would be affected by the behavior of irrational investor in the short term.This study employed the TVIX as proxy indicator for investor sentiment to examine whether the investor sentiment will affect the investor sentiment in Taiwan Stock Market . The empirical results showed that investor sentiment leads significance return and volatility in Taiwan Stock Market and affects volatility through return.