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Keywords: Positive solutionszz,Periodic boundary value problemzz,Fixed point theoremzz正解,周期边值问题,不动点定理
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The fourth order periodic boundary value problem u(4)-m4u+F(t, u(τ(t)))=0, 0(i)(0)=u(i)(2π), i=0,1, 2, 3, is studied by using the fixed point theorem in cones, where F:0, 2π]×R+→ R+ and τ: 0, 2τi]→0, 2π] are continuous and 0-7.