One way to overcome environmental problems due to plastic waste is to use plastic waste as a mixture of asphalt used to increase its durability and toughness. The analysis of the characteristics of asphalt mixtures with plastic waste was conducted using numerical methods and from it the optimum mixture composition can be obtained. The mechanical characteristics taken into account are stability, vertical deformation (flow), and Marshall Quotient (MQ). Based on the results of the study, the higher the amount of plastic added, the stability, flow, and MQ will increase, but air void in the asphalt mixture decreases. It affects the increasing of the softening temperature maintaining the level of strength and hardness of asphalt. Optimum plastic content of 5,36% affects the optimal stability, flow, and MQ, each of which is of 2340,65kg, 5,60mm, and 546,48kg/mm. All the three values have met 2018 Bina Marga standards.