The icing of fan rotor system in icing wind tunnel results in the increase of motor load and the over-limit vibration, which affects the safety and efficiency of icing wind tunnel test. Rotor system is a large-scale high-speed rotating part, in the environment of low temperature and 100% humidity. It is difficult to detect the blade ice, monitor the temperature of heating zone, and provide reliable power supply to the blades of rotor system by high power heating power source. An intelligent icing early warning system based on vibration monitoring of fan rotor and the ratio of motor speed to wind speed in test section is established. A composite anti-icing blade with electric heating film in the leading edge was developed. A multi-channel high linear speed conductive slip ring is developed based on complex working conditions and requirements, and a heating power supply is radially transmitted to each blade through the slip ring and a rotor hollow shaft, thereby solving the problems of arrangement and installation of the power supply and temperature cables from the ground to the fan blades of the rotor system, Completes the large scale fan rotor multi-blade heating power supply and the reliable transmission of temperature signal, realizes the fan blade anti-icing system intelligent start or single-action closed-loop control. The system has been running for more than 4 years. By improving the continuous optimization, the fan blade can be protected against icing in test or deicing quickly after test. The application effect is good, the risk of test safety is reduced, and the capability of wind tunnel is improved.