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创面愈合是一个复杂而关键的过程，包括炎症、增殖和重塑3个阶段。表皮细胞在创面愈合中受到精密调控，一方面创缘周围的角质形成细胞通过迁移、增殖，形成新的基膜覆盖创面；另一方面表皮干细胞经过激活后，增殖分化被促进，终末分化、凋亡被抑制，角质形成细胞和表皮干细胞在各种因素调控下共同促进再上皮化进程。表皮组织中有一群对表皮组织功能维护有关键作用的T细胞亚群——树突状表皮T细胞（DETC）。DETC识别未知抗原后被激活，活化的DETC分泌胰岛素样生长因子Ⅰ、角质细胞生长因子1/2、粒细胞巨噬细胞集落刺激因子、γ干扰素、转化生长因子β等细胞因子，通过调节角质形成细胞迁移、增殖、凋亡之间的动态平衡以及创缘周围表皮干细胞的分化，促进表皮维持稳态和再上皮化。本文就DETC的生物特性、维持表皮稳态、在创面愈合中的作用几个方面展开讨论。“,”Wound healing is a complex and critical process, which includes three stages: inflammation, proliferation, and remodeling. The epidermal cells are precisely regulated in this process. On one hand, keratinocytes around the wound edge migrate and proliferate to form a new basement membrane to cover the wound. On the other hand, the epidermal stem cells are activated with the proliferation and differentiation being enhanced, and the terminal differentiation and apoptosis being inhibited; and together with keratinocytes, epidermal stem cells promote the process of re-epithelialization under the regulation of various factors. In the epidermis, there is a group of resident T cell subsets, dendritic epidermal lymphocytes (DETCs) that play a key role in protecting the function of epidermal tissue. DETCs are activated after recognizing unknown antigens, the activated DETCs secret cytokines such as insulin-like growth factor Ⅰ, keratinocyte growth factor-1/2, granulocyte-macrophage colony stimulating factor, interferon-γ, and transforming growth factor-β, which promote epidermal homeostasis and re-epithelialization by regulating the dynamic balance among keratinocytes migration, proliferation, and apoptosis, and the differentiation of epidermal stem cells around the wound edge. This article discusses the biological characteristics of DETCs and their roles in the maintenance of epidermal homeostasis and wound healing.