Abstract: A method and an apparatus for controlling feeding of solid matter in a process comprising at least one solid matter unloading point (UP), at least one belt conveyor (2, 2?, 3, 5) and at least one solid matter feeding point (SP), solid matter being unloaded in the unloading point (UP) from solid matter storage to a belt conveyor (2, 2?) arranged to convey said solid matter either directly or via at least one other belt conveyor (3, 5) to the feeding point (SP). In the unloading point (UP), the unloading of the solid matter to the belt conveyor (2, 2?) is controlled in such a way that the thickness of the material bed follows a set value determined for it; and in the feeding point (SP), the amount of solid matter to be fed is controlled by controlling the speed (S) of the belt conveyor (2, 2?, 3, 5).