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Porous asphalt uses open-graded with a higher percentage of coarse aggregate than fine aggregate. Porous asphalt has low stability. One of the ways to used to improve the stability of porous asphalt mixture is adding gilsonite as an additive, which aims to improve the quality of asphalt. The use of concrete waste as coarse aggregate can also increase the stability of the mixture. In this study will use concrete waste as coarse aggregate and adding gilsonite as an additive. The proportions of regular coarse aggregates and concrete wastes are 0/100, 25/75, 50/50, and 100/0. The additive used is gilsonite, with gilsonite variations of 5.5%, 6.5%, 7.5%, and 8.5%. The goal of this step was to obtain the optimum asphalt content, optimum concrete waste proportion and optimum gilsonite content. Once the optimum asphalt content, optimum concrete waste and optimum gilsonite content are determined, the related Marshall characteristics could be determined. Based on the testing result, optimal asphalt content is 5.13%, the proportion of optimum concrete waste is 100%, and optimum gilsonite content is 8.5%. The use of 100% concrete waste and adding Gilsonite additive at ranges 8.5% improves the Marshall characteristic, particularly its stability.