Weak current computer room should be built according to standards and specifications. Special color steel plate for shielding machine room should be installed on the inner wall, anti-static floor should be laid on the ground, and aluminum ceiling should be installed on the top. Equalizing rings should be made in the machine room and connected to the lightning protection grounding network, and all metal components and equipment shells should be equipotentially connected. All weak current devices are powered by on-line uninterrupted power supply. Three-level lightning protection should be installed on the power supply lines entering and leaving the computer room, and surge protectors should also be installed on various signal cables.