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MIMO OFDM system is getting mature more and more. MIMO system provides physical support for integrated radar and communication system, while OFDM modulation provides suitable measure of communication. In tradition, communication system receive communication information merely, leaving channel information aside, the information which is precisely the radar system requires. Thus, integrated radar and communication system utilize information more effectively in this way. There are different forms of integrated radar and communication system. Nevertheless, this article underlines the system based upon superimposed pilot, researching and demonstrating the superiority of superimposed pilot over traditional pilot and the splendid performance of its radar system. One of the innovative point this article introduce is the calculation of the account of information of integrated channel directly by Shanon Equation, as well as the research on the influence of the ratio of the power of the radar and communication system on channel capacity.