Abstract:The physical and mechanical properties of cement mortar modified by styrene acrylate rubber(SAR) and styrene butadiene rubber(SBR) are reported.Two kinds of techniques,ordinary technique(A) and polymer pre wrapping technique(B),were used to prepare the polymer modified cement mortar(PCM) samples.It is concluded from the experiments that the mechanical strength of cement mortar formed by polymer pre wrapping technique is higher than that formed by ordinary technique.The resistance of anti freeze thaw of PCM made by pre wrapping technique within a lower polymer cement ratio level is the highest among the polymer modified cement mortar samples. The fluidity of fresh mixed SAR modified cement mortar can be significantly improved after adding small amount of additive.