This paper documents individual investors may be affected by their prior trading experience while they buying stocks. Individual investors have three patterns of repurchasing stocks. They prefer to (1) repurchase stocks that previously sold for a gain, (2) repurchase stocks that have decreased in price since the last sale, (3) purchase additional shares of stocks that have drop in price. This study also tries to figure out how individual investors and which group of individual investors are affected by the mental factor and will they profit from this form of learning. Unlike what U.S. investors’ behave, Taiwanese individual investors do not appear the same preference in the total trading frequency. Investors who repurchase prior losers and stocks that have gone up in price may trade more and it causes that there is almost no difference in the total trading frequency made by investors who repurchase prior winners which have gone down in price and by investor who repurchase prior losers which have gone up in price. This paper also discovers that investors trade more aggressively when stock market is not in the good situation. Moreover, the proportion of investors who repurchase prior winners and investors who repurchase stocks lost in value also rise in this phase. Furthermore, the paper finds that investors hardly make profit by doing activities which were discussed above and figure out the characteristics of the investors who act these behaviors.