In this study, stone Matrix Asphalt mixtures execute the stresses in better way under heavy traffic loads.It is more cost effective than dense graded mixtures and they are largely used as surface-coarse mixtures. This paper discussing a research conducted to analyse the characteristic of bituminous mix modified with waste polythene and coconut fiber. The addition of PET has a significant positive effect on the properties of SMA and it can promote the re-use of waste material in industry in an environmentally friendly and economical way was observed from the final results. Based on the above performance, coconut could be used as stabilizing additive without affecting the design criteria of SMA mixture. The appropriate amount of the addition of PET was found to be 6% by weight of bitumen. This optimum percentage of PET results has given the maximum level of stability. It is calculated that use of waste polythene results in improved engineering properties of bituminous mix. In this paper, utilization of waste plastic and natural fiber to the optimum level and also provides an opportunity to construct an improved pavement material in surface course thus making it more durable. © 2019 Elsevier B.V., All rights reserved.