3U server chassis is also called a 2u rack server chassis. The rack mount is suitable for a 19-inch rack, U is a unit that represents the height of the server outside, and the height of 3u server chassis is 44.445mmX3. 2u server chassis is an important part of the server accessories. Its main function is to place and fix each server accessory, which serves as a support and protection. In addition, the computer case has an important role in the shielding of electromagnetic radiation. It is sconstituted chassis shell, a bracket, a cooling fan, a hard disk connection board, a hard disk box, a panel, a switch, and an indicator light.