本文运用二分性及不动点定理，研究一类时滞Duifing型微分方程χ^n＋χ（t））χ’＋P（t）x＋g（t，χ（t—r））=q（t）的概周期解的存在性，得到Duffing型微分方程的概周期解存在惟一性的充分性定理%In this paper, by means of exponential dichotomy and fixed point theorem, the existence of almost periodic solution of delayed Duffing equations χ^n＋χ（t））χ＇＋P（t）x＋g（t,χ（t-r））=q（t）is investigated, and a sufficient theorem is obtained for the existence and uniqueness of almost periodic solution of delayed Duffing equations.
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