Abstract: In order to improve the strength of crumb rubber powder,this paper presents an experiment on the influence of redispersible polymer powder and superplacticister on the strength of Crumb Rubber Mortar(CRM).The function mechanism of superplacticister and redispersible polymer powder on CRM were also discussed.The test results show that in this experiment,there is certain improvement of strength properties of CRM by redispersible polymer powder,and composite superplacticister and redispersible polymer powder have great effect on the strength of CRM. The test data also show that the size of rubber has great effects on the strength of CRM,which indicated there are the best size of crumb rubber filler particles.