This paper introduces a solution that implements the PDA-oriented portable system in fingerprint recognition and ID authentication, it describes all parts of hardware and software design key technology about data communication between PDA and PC and data communication between PDA and fingerprint module. 介绍了基于PDA的手持指纹身份鉴别系统的实现方案及系统各部分的组成,包括硬件设计与软件设计,重点研究了PDA与PC机、PDA与指纹模块之间通信的一些关键技术。