Take into account of the structure and specific application environment of Zhuhai Land Bureau, considering the practical application and space for future upgrades, allied signal uses a 6-core multi-mode 62.5/125 fiber backbone for data transfer; uses Cat3 25 pairs large logarithm for voice backbone cables inside the building. To desktop data and voice copper cable, CAT5E UTP twisted pair cable is used, logically use tree star topology structure. Increased the network security of the Bureau.