"Micro Cooling Fan" is a DC voltage and electromagnetic induction, the electrical energy into mechanical rotation so as to drive the blades, collectively known as the DC fan. It relies on the coil and the IC constantly switching from driving blades rotating magnetic induction. DC fan is a DC voltage and electromagnetic induction, the electrical energy into mechanical rotation so as to drive the blades. DC fan wheel and blade design, with "Micro Cooling Fan" of the air volume and pressure and compression collision ability blades are closely related, serious point that affects the grade and quality of the entire DC fan, how to design efficient and simple process of "Micro Cooling Fan"has been a major issue of scientific research, design and efficient impeller blades is the main way to solve this problem.