In the new generation of vacuum cleaners, the T12 series, the linear air track is upgraded again. With the motor, dust cup, and cyclone aligned in a straight line, we effectively improve the airflow efficiency and suction power. Through the analysis of the flow performance of the whole machine, we built the optimization model of the central air inlet structure, which reduces the wind resistance coefficient, thereby improving the efficiency of dust collection and prolonging the service life of vacuums. Take the new product T12 Mate an example, compared with T10 Plus, the airflow efficiency of T12 Plus is increased by 10%.