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The ultrasonic dispersion method and mechanical blending method were used tOmodify the calcium sulphate whisker(csw)．Modified CSW were characterized with scanning electronic microscopy(SEM)．The different modified calcium sulphate whisker(CSW)／natural rubber(NR)composites have been prepared respectively,and then the properties of the composites weTe studied．The results showed that the effect of CSW modified by the ultrasonic dispersion method was better than mechanical blending method，and the CSW／NR composites modified by the ultrasonic dispersion method had the optimum properties．