This　paper　studied　the　effects　of　microwave　power　and　time　on　microstructure　and　mechanical　properties　of　Ultra-High　Performance　Geopolymer　Concrete　(UHPGC)　matrix.　Results　show　that　conducting　microwave　treatment　at　curing　age　of　3d　is　suitable,　the　optimal　microwave　power　and　time　are　560　W　and　180　s　with　the　3d　compressive　strength　and　flexural　strength　of　125.4　MPa　and　6.0　MPa.　The　large　amount　of　heat　generates　in　UHPGC　matrix　under　microwave　field,　which　leads　to　the　increase　in　temperature　within　the　UHPGC　matrix.　Due　to　hydration　promotion　caused　by　internal　temperature　rise,　the　tighter　gels　accumulation　and　lower　porosity　can　be　observed,　which　results　in　the　remarkable　improvement　of　compressive　strength.　However,　microwave　heating　causes　higher　proportion　of　large　pores　and　more　generation　of　“melon　seed　flake”　hybrid　crosslinking　products　mainly　including　N-A-S-H,　which　will　result　in　the　reduction　of　flexural　strength.　Moreover,　microwave　pre-curing　is　more　suitable　for　preparing　UHPGC　compared　with　the　oven　pre-curing　comprehensively　considering　the　early　age　compressive　strength　enhancement　and　energy　consumption.　©　2024　Elsevier　Ltd