Abstract: In order to choose the best parameters of tackifier in vacuum assisted resin infusion(VARI) processing, the effects of tackifier on perform permeability, fiber compression and mechanical performance were addressed. The component of tackifier and its melting characteristics were ananlyzed by DSC and IR. The perform permeability, fiber compression characteristics and mechanical performance at different temperatures were examined. It is shown that the tackfier is a kind of polymer with epoxide group and low melting point. For the same tackifier concentration, the perform permeability and compressed thickness decrease as the temperature increasing below 100℃, but between 100℃ and 140℃, the compressed thickness keeps constant and the permeability increases as the temperature increasing. The temperature has no significant effect on the mechanical properties.