With　the　continuous　improvement　of　the　level　of　urbanization　and　the　iterative　progress　of　social　economy,　as　well　as　the　continuous　improvement　of　people＇s　aesthetic　level,　the　public　has　gradually　become　the　participants　and　shapers　of　urban　public　art　practice.　Based　on　this,　this　paper　first　analyses　the　connotation　and　role　of　computer　digital　information　tech,　then　studies　the　application　of　computer　digital　info　tech　in　urban　public　art　space,　and　finally　gives　the　optimization　of　urban　public　art　practice　under　computer　digital　info.　©　Published　under　licence　by　IOP　Publishing　Ltd.