To solve the problem of computer cooling, most computers currently have cooling fan installed in the chassis. with the continuous improvement of CPU main frequency, higher requirements are put forward for fan speed, resulting in the rise of system noise. How to reduce noise generated during fan operation and improve users' comfort moderation is a common concern in the industry. Especially at present, the thin and short chassis has become a platform the main trend of computer development, how to reduce the noise of fans in a narrow space sound, convenient to disassemble and maintain the cooling fan and meet the cooling requirements of the computer, has become the industry urgently needs to solve the problem.

The invention relates to a fixing device of a computer fan, which is provided with a fan bracket on the inner side of a chassis, wherein the computer fan is damped by the screws are fixed on the fan bracket; The fan bracket is provided with bracket fixing holes and the tongue piece, which is provided with a positioning hole at the bottom of the chassis, are installed in the positioning hole can be square then fix the fan bracket on the inside of the chassis; The fan bracket is also opened with there are air holes and heat dissipation holes on the side of the chassis.the air holes and heat dissipation holes corresponding.   This scheme reduces the computer chassis noise and facilitates the fan's disassembly, assembly and maintenance, as well as air flow inside the chassis can not produce turbulence significantly improves the heat dissipation capacity of the chassis.