This research applies Hasbrouck's information share model (1995) and the multiple regression model to discuss the influencing factors of price discovery abilities of futures, based on Wang, Chang, and Lee (2013). Using the data from Taiwan Stock Index Futures and Mini Index Futures, the results show that Mini Index Futures performs better than Taiwan Stock Index Futures in the process of price discovery. Moreover, trading volume and return volatility are both positively correlated with price discovery abilities, while bid-ask spread is correlated negatively with price discovery abilities.