本文使用“签名理论”与“身份旅行”的理论视角，通过田野观察和深度访谈的方法，系统考察了普米族青年以网络昵称为主要线索的网络文化标记物。文章提出“数字签名”的概念，以此描述处于城乡流动中的普米族青年创建、更改和运用网络昵称及其他网络标记物的过程。研究发现，身处城乡流动过程或是有着相关流动经历的普米族青年，通过数字签名的实践完成他们在传统村民与都市打工者、少数民族青年与现代企业职工等多重身份中的旅行。数字签名作为普米族青年定位自身和书写自我的策略，不仅表达了社会转型期的签名者观看、识别、标记、使用以及构建各自身份认同的意愿，同时也显示出普米族青年运用数字技术应对生活处境的能力以及主体重塑的创造力。本文对网络昵称及其他标记物在特定社会情境中被创造和使用的关注，是将签名理论与数字时代中国少数民族青年流动经验结合起来分析的尝试。

Using the theory of “signature theory” and “identity travel”, through field observation and in-depth interview, this paper systematically investigates the Internet cultural markers of Pumi youth with Internet nicknames as the main clue. This paper puts forward the concept of “digital signature” to describe the process of creating, changing and using Internet nicknames and other Internet markers among Pumi young people moving in urban and rural areas. It is found that Pumi youth who are in the process of urban and rural mobility or have relevant mobility experiences complete their travel in multiple identities such as traditional villagers and urban workers, ethnic minority youth and modern enterprise workers through the practice of digital signature. As a strategy for Pumi youth to position themselves and write themselves, digital signature not only expresses the willingness of signers in the social transition period to watch, identify, mark, use and construct their own identity, but also shows the ability of Pumi youth to use digital technology to cope with life situations and the creativity of subject reshaping. This paper focuses on the creation and use of Internet nicknames and other markers in specific social contexts, which is an attempt to combine signature theory with the mobile experience of Chinese minority youth in the digital age.