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MIMO (Multiple input multiple output) technology is a key technology in the LTE system. The quality of signal detection directly affects the performance of the system. This paper introduced several traditional detection algorithms-ML (Maximum Likelihood) algorithm, MMSE (Minimum mean square error) algorithm, the optimal ordering SIC (serial interference cancellation) algorithm, the QR decomposition algorithm and the iterative cycle QR decomposition algorithm. The simulation shows that, ML algorithm has the best performance, but it is a great amount of computation. Secondly, the iterative cycle QR decomposition algorithm has a better performance.