In　recent　years,　most　of　Lora＇s　research　in　the　field　of　wireless　technology　has　focused　on　the　experimental　exploration　of　its　stability　and　communication　range,　without　much　attention　to　the　impact　of　the　actual　transmission　rate.　However,　as　the　length　of　Lora　transmission　load　increases,　the　growth　rate　of　low-speed　transmission　time　is　faster　than　that　of　high-speed　transmission　time.　Therefore,　it　means　that　for　the　transmission　of　large　capacity　packets,　the　lower　the　transmission　rate,　the　more　time　it　takes;　the　longer　the　time,　the　more　power　it　consumes.　In　this　paper,　the　SNR,　RSSI　and　packet　loss　rate　of　Lora　over　3　Kbps　in　urban　area　and　mountainous　area　were　tested　and　explored　respectively,　and　the　RSSI　curve　with　distance　in　different　environment　was　obtained.　The　test　results　show　that　the　actual　communication　distance　of　Lora　with　high　transmission　rate　of　21875　bps　in　line　of　sight　environment　can　reach　3　Km,　packet　loss　rate　is　less　than　1%.　In　addition,　the　influence　of　Lora　on　communication　quality　under　different　occlusion　degrees　in　a　certain　range　was　tested.　In　the　range　of　500　m　to　3　km,　when　the　occlusion　ratio　was　0-5%,　the　highest　speed　reference　value　was　21875　bps,　5-10%　reference　value　was　6250　bps,　and　more　than　10%　reference　value　was　3125　bps.　In　this　paper,　Lora　SX1278　transceiver　was　used,　in　the　same　transmission　of　100　KB　data,　the　actual　transmission　rate　is　further　improved　by　using　the　maximum　duty　cycle　and　improving　the　request　response　mechanism.　Compared　with　a　Lora　system　for　image　transmission,　the　transmission　time　is　reduced　by　81.3%　and　the　transmission　speed　is　increased　by　4.3　times,　which　greatly　improves　the　transmission　efficiency　of　large　capacity　data　such　as　image.　©　2019　Published　under　licence　by　IOP　Publishing　Ltd.