As a part of computer accessories, the chassis mainly plays the role of placing and fixing computer accessories, and plays the role of support and protection. In addition, the computer case also plays an important role in shielding electromagnetic radiation. Although it is not a very important configuration in DIY, it is easy to short-circuit the motherboard and the chassis by using a poor quality chassis, which leads to the instability of the computer system. Chassis [1]? Generally, it includes various switches and indicator lights on the shell, bracket and panel. The shell is made of steel plate and plastic with high hardness, which mainly protects the internal components of the chassis. The bracket is mainly used to fix the motherboard, power supply and various drivers. There are many kinds of chassis. AT present, AT, ATX, micro ATX and the latest BTX-AT chassis are common in the market. The full name should be BaBy AT, which is mainly used in early machines that can only support the installation of AT motherboards. ATX chassis is the most common chassis at present, which supports most types of motherboards. The miniature ATX chassis is built on the basis of AT chassis. In order to further save desktop space, it is smaller than ATX's chassis. Each type of chassis can only be installed with the motherboard of its supported model, and generally cannot be mixed, and the power supply is different. Therefore, everyone must pay attention when shopping. The latest BTX is the abbreviation of balance technology extension. It is a new standard BTX architecture of desktop computing platform defined and directed by Intel, which can support the new form of next generation computer system design and make the industry achieve the best balance in thermal management, system size and shape and noise. BTX's new architecture features: supporting low profile, that is, narrow board design, the system structure will be more compact; Aiming at heat dissipation and airflow movement, the circuit layout of the motherboard is optimized. The installation of the motherboard will be easier and the mechanical properties will be optimized. Basically, BTX buildings are divided into three types, namely standard BTX, micro BTX and pico BTX. From the size point of view, all the series of BTX platform motherboards are not smaller than ATX motherboards, so the development of BTX is not a smaller desktop computer. More flexible circuit wiring and modular component area are the focus of BTX. The most obvious difference between BTX chassis and ATX chassis is that the side panel that can only be opened on the left side has been changed to the right side. And other I/O interfaces are correspondingly changed to the opposite positions.