Abstract: Antenna selection can increase channel capacity in MIMO system,and can also effectively decrease the system complexity and the Radio frequency cost.Antenna selection algorithms are discussed,and a new fast algorithm is proposed based on norm and correlation of row vectors,which gets more channel capacity and has low complexity because of avoiding matrix operation.At last simulation analysis and comparisons indicates that the new algorithm is almost near to the optimum one,much better than others,when receiving antenna number is not equal to transmitting’s.