By using event study, this paper studies the reactions of the trading volume and returns to the stock rename announcement. It discovers that the rename announcement contains certain information content and the regression analysis on the abnormal trading volume reveals that the abnormal trading volume has a negative correlation with the size of the company. The trading volume to the stock rename in 2000 has a stronger reaction than that of 2001. And when the rename takes place, the abnormal trading volume and returns have asymmetrical correlation.