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We prove that for initial data of the form u∈0(x)=(vh 0(x∈),∈-1v3 0(x∈)T,x∈=(xh,∈x3)T,the Cauchy problem of the incompressible Navier-Stokes equations on R 3 is globally well-posed for all ∈> 0,provided that the initial velocity profile v0 is analytic in x3 and certain norm of v0 is sufficiently small but independent of ∈.