Abstract: Activated carbon have the character of well- developed pore structure, surface area, adsorption. So preservatives can be made by putting active carbon into saturated potassium permanganate solution.Preservative paper was developed by the method of putting preservatives into pulp. Then preservative paper's preservative effects was tested. The results showed that preservative paper could slow down tomato's senile apparently, the respiratory rate of experimental group was lower than the control group ( p < 0.05) and the preservative paper putted off tomatoes' s respiratory summit 3⁵d; titratable acids and hardness of the experimental group declined more slowly than the control group ( p < 0.05) ; the change rate of experimental group's SSC was apparently lower than the control group ( p < 0.05) ; the experimental group's weight lose ratio became slower than the control group ( p < 0.05) .It turned out that the preservative paper has good preservative effects to delay fruits' ripening rate.