Abstract: A method for regulating the actual mass flow of spreading material of a regulated metering unit of a disc spreader with a distribution disc associated with the metering unit. A target mass flow of spreading material is determined depending on at least a plurality of spreading parameters and the target mass flow is provided as input to a computer-based regulating device as a reference value. A regulating mode of the regulating device the deviation of the actual mass flow of spreading material from the target mass flow is determined and an actuating variable representative of the opening position of the metering unit is generated depending on the actual revolution rate of the distribution disc or of the shaft in the drive train itself in order to readjust the metering unit to the target mass flow.