We have discussed about how to extract signal in order according to signals'character in this paper

which is an important problem in the subject of blind separation.A sequential blind signal extraction algorithm in order based on genetic algorithm is proposed

which can ensure extraction of source signals accroding to the order of absolute kurtosis of signals

it avoid the problem that many algorithms based on gradient descent approach get into part extremum easily.Moreover

a deflation algorithm based on Schmidt orthogonal is proposed

which not only simplify the computation of the deflation algorithm in Cichocki- Thawonmas-Amari(1997)

but also whiten the mixed signals in the same time.Simulation results show that the algorithm can ensure the extraction of signals in order.