(The data transmission technology of embedded TCP/IP protocol microcontroller in network communication is introduced. The TCP/IP protocol is embedded in the single-chip microcomputer, and the data transmission of the single-chip computer in the local area network and on the Internet through the local area network is realized by means of the network card chip CS8900. The user terminal takes the single-chip system board as the preamble, and realizes data communication with the remote data terminal through the network.)