《身份》是昆德拉著名的“遗忘三部曲”中的一部。他在作品中致力于对人的“存在”的思索。在《身份》中,他以简洁的文笔表现出深刻的主题。由于对人与人之间的边界的遗忘,由于事件发展的不确定性、可能性,有时人们善意的“越界”却会引发背离初衷的结局。本文从边界、遗忘、可能性之树三方面探析《身份》的主题。 “Identity” is one of Kundera’s famous “Forgotten Trilogy”. In his work, he is devoted to thinking about man’s “existence.” In “Identity,” he expresses his profound theme with simple writing. Due to the oblivion of the boundary between people, due to the uncertainty and possibility of the development of the incident, sometimes people’s “cross-border” in good faith can lead to the departure from their original intention. This article explores the theme of “identity” from three aspects: the border, the forgotten, the tree of possibilities.