A method for processing a list of orders in a system for preparation of orders, each order comprising one or more order lines, each order line comprising an order identifier, a reference and a unit load quantity, and a priority level, said system for preparation of orders comprising a control system and at least one preparation station receiving source loads (A to G), each containing unit loads of one or more of the references, and shipping loads (41 to 48), each intended to contain the unit loads of one of the orders, said at least one preparation station comprising: - a sampling position, which is unique and configured to allow sampling, in one of the source loads, of at least one unit load of one of the references in accordance with one of the order lines; - an insertion position, which is unique and configured to allow insertion, in one of the shipping loads, of said at least one sampled unit load; and - recirculation means (2, 4, 11, 12), configured to allow some of the shipping loads to be placed several times in the insertion position; characterised in that the control system performs the following steps: - selecting a reference present in the largest number of order lines among all the order lines of said list of orders; - determining a set E of all N E orders each containing an order line containing said selected reference; - creating a group G of N orders which are either the N E orders, if N E ≤N max with N max a predetermined threshold, or the first N max orders resulting from a sorting of the N E orders in decreasing sequence of the level of priority, if N E >N max; - constructing a list LC of all the K order lines contained in the N orders of the group G, while respecting the following rules - if several of the K order lines contain an identical reference, they follow one another in the list LC in the form of a sub-list; - the N order lines included in the sub-list corresponding to said selected reference contain N different order identifiers in a given sequence; and - the order lines not included in the sub-list corresponding to the selected reference contain order identifiers, among the N order identifiers, in a sequence consistent with the given sequence taken in a loop; and - controlling system for preparation of orders to bring source loads to the sampling position and shipping loads to the insertion position, and recirculate shipping loads to the insertion position, according to the list LC. - a sampling position, which is unique and configured to allow sampling, in one of the source loads, of at least one unit load of one of the references in accordance with one of the order lines; - an insertion position, which is unique and configured to allow insertion, in one of the shipping loads, of said at least one sampled unit load; and - recirculation means (2, 4, 11, 12), configured to allow some of the shipping loads to be placed several times in the insertion position; characterised in that the control system performs the following steps: - selecting a reference present in the largest number of order lines among all the order lines of said list of orders; - determining a set E of all N E orders each containing an order line containing said selected reference; - creating a group G of N orders which are either the N E orders, if N E ≤N max with N max a predetermined threshold, or the first N max orders resulting from a sorting of the N E orders in decreasing sequence of the level of priority, if N E >N max; - constructing a list LC of all the K order lines contained in the N orders of the group G, while respecting the following rules - if several of the K order lines contain an identical reference, they follow one another in the list LC in the form of a sub-list; - the N order lines included in the sub-list corresponding to said selected reference contain N different order identifiers in a given sequence; and - the order lines not included in the sub-list corresponding to the selected reference contain order identifiers, among the N order identifiers, in a sequence consistent with the given sequence taken in a loop; and - controlling system for preparation of orders to bring source loads to the sampling position and shipping loads to the insertion position, and recirculate shipping loads to the insertion position, according to the list LC.