In this paper we establish the Floguet theory for the quasi-periodic system
where A(
u1,
u2....
um) is an nxn periodic matrix function ofwith period 2π, and it is of C
τ, τ=(
N+ 1)τ
0, τ
0=2(
m + 1), N = (1/2)n(n + l).Meanwhile, we define the characteristic exponential roots β
1,β
2,…,β
n of (0.1), and assume that
where K(ω), K(ω,β)->0. k
u, i
v, are integers, all the integers k
1,k
2,…,k
m,k
m are not zero,,
,rhen therequasi-periodic linear transformation, which carries (0.1) into a li near system with constant coefficients.