5G　is　the　fifth　generation　of　mobile　communication　technology.　It　is　a　perfection　and　innovation　based　on　4G　technology,　which　greatly　improves　the　transmission　speed　of　data　information.　With　the　gradual　integration　of　5G　wireless　communication　technology　into　people＇s　daily　life,　It　has　higher　transmission　efficiency,　data　information　coverage,　etc.　in　practical　applications,　and　has　a　good　development　prospect　in　the　future　communication　industry.　This　paper　takes　the　key　technologies　of　5G　as　the　research　object.　On　the　basis　of　expounding　the　basic　characteristics　and　development　status　of　5G　technology,　it　analyzes　the　key　technologies　and　their　applications　of　5G,　and　analyzes　their　development　status　in　smart　medical　care,　transportation　and　agriculture.　5G　technology　will　provide　people　with　more　efficient　and　affordable　remote　treatment　in　the　future.　With　the　blessing　of　5G　technology　in　transportation,　people＇s　travel　will　be　more　convenient,　and　rail　transportation　will　also　usher　in　new　opportunities.　It　can　give　full　play　to　the　carrying　capacity　of　rail　transportation　and　share　the　burden　of　express　transportation　for　road　transportation.　In　terms　of　agriculture　industry,　the　characteristics　of　5G　technology　make　agricultural　development　more　intelligent　and　rely　less　and　less　on　labor,　which　not　only　improves　the　efficiency　of　agricultural　sowing　and　harvesting,　but　also　reduces　the　probability　of　low　crop　yields.　This　article　will　provide　a　reference　for　people　to　explore　the　application　and　development　of　5G　and　more　advanced　communication　technologies　in　all　walks　of　life　in　the　future,　or　guide　the　development　direction　of　communication　technology.　©　VDE　VERLAG　GMBH　∙　Berlin　∙　Offenbach.