Abstract: A method of regulating a grinding process in a pocket grinder pressing a wood batch in at least one pocket against a rotating grindstone with a grinding plate movable in the pocket calculates the apparent pulp quantity produced at measuring points at fixed intervals of the grinding stroke and changes in the wood batch density which occur during the grinding stroke. The value thus calculated is compared with a target value for the pulp quantity to be produced and the grinding process regulated thereby to reach the target value. To make the pulp quantity produced as even as possible, the calculated value of the apparent pulp quantity produced is corrected in relation to the hydraulic pressure used during the grinding stroke.