In　this　research,　we　study　a　scheduling　problem　in　mail-order　pharmacy　automated　distribution　(MOPAD)　system.　In　MOPAD　scheduling,　two　kinds　of　objective:　the　collation　delay　(CD)　and　makespan,　should　he　considered　and　in　the　previous　study　of　some　of　authors　three　kinds　of　genetic　algorithms　(GA)　are　applied　and　evaluated.　In　this　paper,　we　apply　constraint　programming　(CP)　for　the　scheduling　problem.　We　proposed　a　CP　formulation　of　the　problem　and　evaluated　through　computational　experiments.　The　results　show　that　the　proposed　method　is　effective　for　small-scale　problem　but　further　study　is　required　to　compare　with　GA　methods　in　large-scale　problems.