The　significance　of　the　mechanical　properties　of　solid　propellant　during　the　curing　process　lies　in　their　contribution　to　stress-strain　calculations　of　viscoelastic　engineering　materials　and　the　analysis　of　structural　integrity　of　solid　rocket　motor　charges.　In　order　to　study　the　Constitutive　equation　of　the　nitrate　ester　plasticized　polyether　(NEPE)　propellant　during　the　curing　process,　indentation　creep　tests　were　carried　out　on　the　NEPE　propellant,　and　the　viscoelastic　constitutive　model　of　propellant　with　curing　reaction　at　50　degrees　C　and　atmospheric　pressure　was　studied.　Firstly,　based　on　the　viscoelastic　theory,　the　experimental　principle　of　indentation　creep　test　is　deduced,　and　indentation　creep　tests　are　carried　out　for　propellants　with　different　curing　degrees.　Then,　based　on　2S2P1D　(2　Springs,　2　Parabolic　elements,　1　Dashpot)　model　and　time-temperature　equivalence　principle,　the　indentation　test　data　are　processed,　and　the　complex　modulus　master　curve　of　propellant　with　different　curing　degrees　is　established,　and　the　influence　of　curing　reaction　on　viscoelastic　properties　of　propellant　is　analyzed,　so　as　to　better　understand　the　response　characteristics　of　propellant　system　during　curing.　The　results　show　that　the　2S2P1D　model　has　a　good　fitting　effect　for　the　master　curve　in　low　frequency　period,　the　fitting　error　is　controlled　within　10　%,　and　the　correlation　coefficients　are　all　above　0.95.　With　the　curing　reaction,　the　complex　modulus　gradually　increases,　while　the　change　rate　gradually　decreases.　And　it　tends　to　be　stable　on　the　seventh　day.　image