One of the ways of making pavements with high quality is making some amendments in consumption bitumen so that the final asphalt mixture would have a higher quality in order to use in the tropics. The aim of this study is study on SBS polymer in order to modify of the properties of polymer modified bitumen has been to SBS bitumen characteristics. The lack of bitumen qualifications modification led to procedural failures caused by the heat of the tropics regions. Obviously, bitumen characteristics modification cause to produce higher quality asphalts in order to use of pavement in tropical regions. With producing this kind of asphalts, maintenance costs of highways will be reduced. In this research, was attempted various methods to remove these drawbacks. Technical assessment to evaluate the effect of SBS polymer on bitumen properties include two types of tests Bitumen tests and asphalt tests. In this research Comparison the effects of the polymer amount on penetration, softness and density degree of bitumen and also asphalt was examined. Since it is currently challenging to perfectly achieve all expected polymer modified bitumen properties at the same time, some compromised recommendations are given in this paper, among which greatly enhancing the properties with an acceptably high cost, significantly reducing the cost with relatively poor properties and their combinations. (C) 2015 IASE Publisher. All rights reserved.