This research is studying the prediction of the price of the option mainly. Firstly, Two parameters of underlying asset and volatility can be predicted by time series form. Secondly, choosing Black-Scholes、finite-difference method and Monte-Carlo simulation method three different methods to forecast the price of the option in the future, and then compare with the price of the market. Using TAIEX Index Option expired on April in 2005 as example, the option priced by finite-difference method is more approximated to the price of the market under the measure standard of mean square error and mean absolute error. Therefore, the research offers a way to predict the price of the option for the application on the practice.