Abstract: The rotating drum of a certain type of concrete mixing truck is studied.A mathematical formulation was derived through the force analysis to calculate the supporting forces.The calculation method of the concrete distribution shape in the rotating drum is developed.A new transfer matrix is built with considering the concrete geometric distribution shape.The effects of rotating speed,inclination angle and concrete liquid level on the vibration performance of the rotating drum are studied with a specific example.Results show that with the increase of rotating speed,the vibration amplitude of the rotating drum decreases.The maximum vibration amplitude is almost not changed and the peak amplitude gradually moves to the right with the inclination angle increasing.The maximum unbalanced response amplitude of the drum increases with the decrease of concrete liquid level height,and the vibration peak moves to the left.