Previous studies find mixed results on the relation between exchange rate movement and stock return. We revisit the issue by exploring the effect of market efficiency and heterogeneous investor’s reaction to exchange rate changes using the recent event of Chinese currency appreciation. Our results show that different investor groups react differently to the exchange rate appreciation and that this can be explained by the differences in information access and demand elasticity. In addition, we find that investors with limited investment opportunities react more positively to exchange rate appreciation. Our results suggest that it is important to consider the issues of market efficiency and the differences among investors when one analyzes the relation between exchange rate movement and stock return.