Abstract: Focusing on the simple yet decisive problem about the transmission of SEM Laboratory's data, this article mainly discusses the method about how to apply LAN to SEM Laboratory and build up the construction of LAN with the equipment that is available in SEM Lab. The constructed LAN shows outstanding excellence in view of its convenience, rapidness, efficiency and its perfect adaptation of a unified management process. What's more, the project suggested in this article can also be applied to the mass transmission of data in other analysis laboratories.