The　interfacial　bond　strength　between　aggregate　and　cement　paste　was　changed　by　using　different　interface-treating　technology　for　researching　the　effect　of　aggregate-cement　paste　interface　on　the　stress-strain　curve,　fracture　energy　and　crack　propagation　model　of　concrete.　The　study　shows　that　enhancing　the　aggregate-cement　paste　interface　can　increase　the　compressive　strength　but　decrease　the　toughness　of　concrete.　Weakening　the　rough　aggregate-cement　paste　interface　can　increase　the　strength　with　decreasing　the　tougthness　of　concrete　at　the　same　time.　However,　weakening　the　fine　aggregate-cement　paste　interface　can　increase　the　fracture　energy　of　concrete,　the　reason　of　which　is　that　the　initial　imperfection　in　concrete　induces　the　macro　discrete　crack　into　smeared　crack　that　dispersed　in　the　mortar,　which　can　increase　the　effective　crack　length　and　the　fracture　process　zone,　so　the　deformation　performance　of　concrete　was　improved　obviously.