Abstract: In order to improve the heating efficiency of integrated ceiling heaters used in bathrooms, a multi blade centrifugal impeller blade structure and its design method were studied using a certain brand of bathroom electric heating equipment as an example under the blowing condition. Using CFX commercial fluid simulation software, and based on the results of CFD simulation, the shortcomings and defects of the original impeller in aerodynamic design were analyzed. Based on the design method of the original impeller blade profile, the acceleration of the complex line of wind channel impeller formed by fiting logarithmic spiral lines and small arcs was proposed and designed. After comparing and analyzing the aerodynamic performance of the compound profile impeller with the original impeller through 3D printing, it is concluded that the air flow rate at the blower outlet is 216.2 m~3/h, which increases by 13.9%, and the airflow speed at the outlet is more uniform and stable. In addition, the noise of the fan has decreased by 2.3 dB, which significantly improves the aerodynamic performance and heating efficiency of the heater. The numerical simulation and experimental study has theoretical significance and important engineering application value for the performance optimization and noise reduction design of multi-wing centrifugal heaters.