Abstract: Based on channel capacity maximization criterion, traditional antenna selection algorithm scan maximize the channel capacity, but the computational complexity is very high. Aimed at the problem of high computational complexity, a new antenna selection algorithm with low complexity based on Doolittle-QR decomposition is proposed. Based on Doolittle-QR decomposition, the proposed antenna algorithm can quickly select the antenna which can maximize the system capacity. Compared to the traditional antenna selection algorithms,the computational complexity of the proposed antenna algorithm is effectively reduced, and the capacity performance is close to the traditional methods. In 60GHz indoor channels, simulation results demonstrate that the proposed antenna algorithm enjoys favorable performance,which is better than that of the random antenna selection algorithm and close to the optimal antenna algorithm.