In　this　paper,　we　suggest　a　simple　method　of　making　specified　random-phase　shifters　which　are　used　for　speckle-shift　multiplexing　in　photopolymers.　Compared　with　other　kinds　of　diffusers,　they　are　easier　to　be　made　and　designed　to　control　the　average　speckle　size　so　as　to　accommodate　the　requirement　for　high　storage　density.　The　experimental　scheme　and　the　theoretical　calculation　of　the　desired　speckle　size　are　given.　Then　the　difference　between　the　experimentally　measured　and　theoretically　calculated　speckle　size　is　discussed.　Finally　the　unfavorable　factors　which　influence　the　performances　of　shift-multiplexing　using　this　scheme　are　discussed,　and　the　feasible　solutions　to　those　problems　are　given.