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<正> In this paper we consider nonlinear control sysfemdx/dt=A（t）x+B（t）f（x）,（1）Where x（t）∈Rn is the state vector,A（t）=(aij（t）)n×nis the System matrix,B（t）,an nxr time-varying matrix,is the input matrix;f（x）∈Rr is nonlinearvector function,and A（t