HNS-Ⅳ(Hexanitrostilbene-Ⅳ)is　the　main　charge　of　the　exploding　foil　initiators(EFI),and　the　micro-structure　of　the　HNS　will　directly　affect　its　density,flowability,sensitivity,and　stability.HNS　micro-spheres　were　prepared　using　droplet　microfluidics,and　the　particle　size,morphology,specific　surface　area,thermal　performance,and　ignition　threshold　of　the　HNS　microspheres　were　characterized　and　tested.The　results　shown　that　the　prepared　HNS　microspheres　have　high　sphericity,with　an　average　particle　size　of　20.52　μm(coefficient　of　variation　less　than　0.2),and　a　specific　surface　area　of　21.62　m2/g(6.87　m2/g　higher　than　the　raw　material).Without　changing　the　crystal　structure　and　thermal　stability　of　HNS-Ⅳ,this　method　significantly　enhances　the　sensitivity　of　HNS-Ⅳ　to　short　pulses　and　reduces　the　ignition　threshold　of　the　slapper　detonator　to　below　1000　V.This　will　contribute　to　the　miniaturization　and　low　cost　of　EFI.