The invention relates to maintenance of asphalt roads. The weight percent of a curing agent is: asphalt 100, rubber powder 2-25, resin 3-10, rubber 2-16, the cross linker 2-10, the resin acceptor 1-6,the emulsifier 1-20, some antiaging agent, the active agent 30-300, foaming agent and defoaming agent. The process is: preprocessing materials, composite modifying, emulsifying, adding auxiliary materials to smelt. The construction program is; artificial daub, kneading by the foam maker and curring. The curing agent has the good bonding performance and waterproof effect.