Abstract: Abstract: The Natural killer ( NK) cell is a lymphocyte that consisted by several subgroups，it has different kinds of receptors and displays various functions． Although the NK cell has been traditionally classified as cells of the innate immune system，it shares many similarities with adaptive lymphocyte，especially with cytotoxicity T lymphocytes． It sways great influence on immune memory，natural killing，anti-viral and anti-tumor． In this assay， we reported the latest findings on the classification of NK cells as well as its receptors and functions．

Key words: natural killer cell, receptor, function

摘要： 摘要: 自然杀伤( natural killer，NK) 细胞是由多种亚类组成的淋巴细胞，具有多种不同受体，表现出多种功能，同时 具有先天性免疫细胞和后天免疫细胞，特别是杀伤性T 细胞的特性，在免疫记忆、自然杀伤、抗病毒和抗肿瘤方面 都有重要作用。本文综述了NK 细胞的分类、受体和功能的研究进展。

关键词: 自然杀伤细胞, 受体, 功能