This invention relates to a multi-in multi-out test method based on reducing condition numbers including: carrying out channel estimation to received signals to get a channel property matrix H of row M, orderly eliminating the ith row of H to make up of M channel matrix Hi of the new M-1 rows, computing the condition numbers of them and selecting the Hi with the smallest condition numbers as the output, selecting K estimations to the ith transmitted signals to let the received signal r deduct the re-built signal of the signal so as to generate K new received signals, a test method includes utilizing matrix Hi to test the remaining M-1 matrixes to constitute estimation of M data together with the ith data to generate estimation of K groups of data and selecting the optimum data from the data to be output. |