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Lots of chat software and e-mail client software can run in the personal computer, but for some specific embedded network terminal, which leads to some problems like big size and so on. Aiming at the hardware systems and operating systems of embedded network terminal, solutions for chat software and e-mail client software based on embedded network terminal were proposed. In this paper, the design of chat software and e-mail client software were described in detail, after analyzing the network socket programming, the e-mail system theory and related protocols. The chat software successfully achieves the communications of embedded network terminals and embedded network terminals, the communication of embedded network terminals and personal computers. The e-mail client software is provided with Greater flexibility and scalability. It not only can send and receive messages in both English and Chinese, but also possess of other functions, for example, displaying the mail attachment content without downloading or downloading attachment.