High strength concrete is widely used especially during the last century. High Strength concrete means concrete with max. Compressive strength ( )more than 50 N/mm2 (Shetty, 1988). Polymer modified concrete was) used since 1970s by adding polymer monomers such as styrene Butadiene rubber (SBR) to ordinary concrete during casting as a percentage of weight of cement in order to improve the mechanical properties of concrete.This research includes the study of the effect of styrene Butadiene Rubber on Tensile Strength of Polymer modified concrete PMC, also include the effect of the polymer on compressive strength and relationship between tensile and compressive strength (as a mathematical model). A different types of mixes (1: 1.5: 2, 1:1.5:3 and 1:2:4) were used in this research.