本文主要研究滿足一般邊界條界的Non-Hermitian Su-Schrieffer-Heeger (nSSH)模型。我首先介紹Su-Schrieffer-Heeger (SSH)模型，透過bulk edge correspondence來預測該系統邊界態的數目。接著將這些想法推廣至non-Hermitian的系統，並且介紹更一般的邊界條件。我發現不同於SSH模型，此時系統存在skin effect及exceptional points。並且列出exceptional points出現的條件，討論其中有趣的性質。

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