Photocatalysis　properties　enhanced　by　metal　and　organic　polymer　has　been　received　more　interest　because　of　their　ability　to　directly　or　indirectly　degrade　pollutants.　The　effect　of　PDA　(polydopamine)　and　Ag　nanoparticles　on　the　different　phases　of　ZnO　to　degrade　organic　dyes　under　visible　(vis)　and　Ultra-violet-visible　(UV-vis)　light　was　investigated.　ZnO@PDA,　ZnO-Ag,　and　ZnOAg@PDA　nanoparticles　were　synthesized.　It＇s　shown　that　Ag　particles　with　sizes　of　less　than　20　nm　were　deposited　evenly　on　the　ZnO.　There　were　a　few　changes　in　the　structure　of　ZnO@PDA　or　ZnOAg　@PDA.　When　the　ZnO　was　coated　by　PDA,　the　photocatalytic　activity　could　be　enhanced.　The　photocatalytic　activity　under　UV-vis　and　visible　light　of　the　ZnO@PDA　were　effectively　improved.　The　degradation　rate　of　ZnO-Ag@PDA　was　97.9%　under　UV-vis　light　for　20　mins,　which　was　16.1%　higher　than　that　of　ZnO.　The　photocatalytic　activity　of　ZnO-Ag@PDA　reached　the　maximum　after　polymerizing　for　2　hours.　The　photocatalytic　efficiency　of　ZnO-Ag@PDA-2h　under　UV-vis　for　30　minutes　can　reach　higher　than　99.01%.　The　photocatalytic　performance　decreased　rapidly　with　the　increasing　cycles.　When　the　number　of　cycles　was　5,　the　degradation　rate　was　65.84%.　Afterward,　the　degradation　rate　changed　small　and　became　stable.