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This paper obtain that the radius of starlikeness for class s(α,n)in[1] is,repectively,r1(α,n)=｛√[(1+n)α-n]^2+1-2α+(1+n)α-n/1-2α｝^1/n,0≤α≤α0,r2(α,n）=｛4[n√α（1-α）-α/（1+n)^2(1-α）-4α｝^1/(2n>,α0≤α≤1,where α0 is unique solution of equation √αα=σ with α in(0,