Abstract: This paper proposes a fuzzy variable structure controller for a nonlinear, multivariable, and strongly coupled rotating inverted pendulum system. This controller combines fuzzy control with sliding mode variable structure control, maintaining the speed and robustness of sliding mode variable structure control while effectively eliminating chattering issues caused by using sliding mode variable structure alone. Simulation results show that the fuzzy variable structure control algorithm can achieve balanced attitude control of the inverted pendulum, effectively eliminating chattering and exhibiting strong robustness. Keywords: rotational inverted pendulum, fuzzy variable structure controller, chattering, balancing attitude control. Abstract: A Fuzzy Variable Structure Controller (VSC) was designed, combining fuzzy control and variable structure control for nonlinear, multi-variable, unmatched disturbance rotational inverted pendulum systems. The controller not only maintains the sensibility and robustness of VSC but also efficiently reduces chattering generated by VSC. Simulation results show that blanching control can be implemented, chattering is significantly reduced, and good robustness is achieved. Keywords: rotational pendulum, fuzzy variable structure controller, chattering, balancing control. 0. Introduction Compared to traditional trolley-type inverted pendulums, the rotational inverted pendulum reduces the transmission mechanism in hardware, making it simpler and more robust. However, the device is also more complex, exhibiting greater nonlinearity and instability, increasing the difficulty of control. Numerous control theories have been applied to the study of inverted pendulums, including classical control theory, PID control, fuzzy control, neural network control, genetic algorithms, variable structure control, and multi-model fuzzy control. This paper employs a fuzzy variable structure controller based on pole placement to achieve steady-state control of a rotating single-full-point inverted pendulum. For details, please click: Design of a Rotating Inverted Pendulum System with Fuzzy Variable Structure Control