A　air　of　cascade　lenses,　a　Fourier-transform　lens　and　an　imaging　lens,　is　the　key　component　in　a　volume　holographic　clata-storage　system　(HDSS)　for　writing　in　and　reading　out　the　information　in　holographic　recording　material　respectively.　For　a　high-density　holographic　data-storage　system,　performances　of　these　lenses　are　critical.　In　order　to　obtain　precise　input　and　output　information,　and　reduce　the　bit-error　rate　in　the　retrieved　data,　the　accurate　pixel　matching　between　the　whole　high-resolution　page　of　SLM　and　CCD　must　be　ensured.　To　meet　these　requirements,　in　this　paper　the　design　of　this　lens　is　discussed　in　detail,　In　this　paper　we　designed　the　lenses　of　unsymmetrical　structure　and　compact　profile,　and　the　maximal　image　distortion　of　the　lens　less　than　0.01%,　and　the　MTF　value　at　the　spatial　frequency　40　LP/mm　greater　than　0.5　over　the　whole　view-field.　Other　aberrations　such　as　spherical　aberration,　field　curvature,　comatic　were　well　corrected.　The　lens　can　realize　pixel　matching　between　1024　X　768　of　SLM　and　CCD.　Furthermore,　the　effect　of　the　manufacture　accuracy　of　the　lens　on　its　image　quality　was　analyzed,　based　on　which　the　optimum　parameters　and　manufacture/assembly　tolerance　are　given.