In　this　study,　we　report　ultraviolet　photoresponse　enhancement　of　diamond　photodetector　by　applying　patterned　diamond　film　design　and　two-step　growth　process.　Diamond　stripes　are　fabricated　on　the　surface　and　interdigitated　electrodes　are　set　perpendicular　to　them.　Before　second　step　growth,　surface　defects　induced　during　etching　process　affect　the　responsivity　of　supra-band　gap　light.　After　second　step　growth,　the　surface　defects　are　suppressed,　then　the　responsivity　of　photodetector　on　diamond　strips　are　larger　than　that　of　photodetector　on　continuous　diamond　film.　The　larger　responsivity　could　be　attributed　to　the　quasi-one-dimensional　carrier　transport　and　large　surface　to　volume　ratio.　In　additionally,　a　large　electrode　space　is　helpful　in　enhancing　ultraviolet　photoresponse　while　suppressing　the　visible　response.