On the basis of analysis of the principle of using option contracts to avoid the price fluctuations risk, this paper shows the option strategies available in inventory purchasing and selling processes. Then, the mean variance model is used to determine the optimal option contracts trading volume which maximize the utility of the investment portfolio and its impact on operating profit. The conclusions are as follow: strategies like purchasing call options and the combination of purchasing call options and selling put options in inventory purchasing process can avoid purchasing price fluctuations risk; strategies like purchasing put options and the combination of purchasing put options and selling call options in inventory selling process can stabilize sales profits; from the aspect of the optimal option contracts trading volume and its impact on the operating profit, we find options play a good role in controlling purchase prices and stabilizing sales profits.