Under the framework of Rational Expectation Equilibrium (REE), the paper analyzes the impacts of insider trading on the secondary market in the order-driven system. We show that when insider trading is allowed, the average price will not change and there is a positive correlation between the future price and the current price. The volatility and liquidity change without sure direction with insider trading. The price efficiency is a special case with and without insider trading. The insider is benefit by insider trading wherever the outsider and liquidity trader may be benefit or hurt by insider trading.