A packing method of packing articles into a packing box comprises pre-grouping articles on a pre grouping surface provided by a pre grouping conveyor belt of a pre grouping conveyor, and providing the articles from the pre-grouping surface of the pre-grouping conveyor belt into the packing box. This is done consecutively by providing one of a cassette box and the packing box at a discharging end of the pre-grouping conveyer; moving downwards said one of the cassette box and the packing box while driving the pre grouping conveyor belt such that the pre-grouped articles on the pre-grouping conveyer-belt moves towards the discharging end of the pre-grouping conveyor and the opening of said one of the cassette box and the packing box, and that the articles of the pre-grouped articles are discharged from the pre-grouping conveyor belt into said one of the cassette box and the packing box and onto one another; and, in case the articles of the pre-grouped articles are provided into the cassette box, providing the articles from the cassette box into the packing box.