In real life, the bounded rationality of investors tended to violate the expectation of rationale decision-making in investment behavior. One of the noticeable portfolio puzzles was the disposition effect, a behavioral bias which the investors were willing to realize paper gain instead of paper loss in the stock market. Therefore, this study used holding time to investigate the disposition effect in Taiwan Futures Market. Results of this study showed that the trade duration for natural persons facing initial loss in the futures market was longer than the trade duration when they faced the initial gain. In other words, the investment behaviors of the above mentioned investors revealed disposition effect. However, the relationship between disposition effect and investment performance had not yet been evidenced. Thus, whether the disposition effect in the futures market was an irrational behavior or not needed to be figured out in the future.