This paper extends the model built by Easley & O'Hara (1987) to develop a two-period model to analyze how options trading influence the stock market. In our model, informed traders should decide how to use his private information to make profit from stock and option trading. We find that the informed traders are unwilling to trade with larger amounts in the stock market. The reason is that trading with larger amounts will worsen the stock price conditions and then reduce the profits of trading options. Furthermore, we also examine the relative variables that determine the stock trading volume and the option strategies.