The　hysteresis　curve　is　used　to　reflect　the　hysteresis　phenomenon　of　the　reducer,　but　in　engineering　practice,　the　morphologic　characteristics　of　the　hysteresis　curve　are　ignored　and　default　to　have　the　loading　rate　independence.　The　loading　rate　dependence　of　the　morphologic　of　the　hysteresis　curve　of　the　reducer　is　demonstrated,　and　the　specific　impact　is　analyzed.　Four　parameters　are　proposed　to　characterize　the　morphological　characteristics　of　the　hysteresis　curve,　and　the　physical　meaning　of　each　parameter　is　given.　Through　further　experimental　research,　it　has　been　verified　that　the　morphologic　of　the　hysteretic　curve　of　the　reducer　has　the　loading　rate　dependence,　and　the　changes　of　the　four　parameters　of　the　reducer　with　different　materials　under　different　loading　rates　are　clarified.　Finally,　it　points　out　the　value　of　the　morphologic　characteristics　of　the　hysteresis　curve　in　theory　and　engineering　application.　©　2024　Chinese　Mechanical　Engineering　Society.　All　rights　reserved.