Abstract: Natural rubber and chloroprene rubber blends technology was developed and the effect of ratio between NR/CR on the property of the rubber was studied.The results showed that natural rubber and chloroprene rubber blends has the better mechanical properties.With more natural rubber in composition,the blend cures fast,and the flame resistance and weather aging performances of the rubber are poor,while with more chloroprene rubber in composition solvent resistance and flame resistance of the rubber are better.