Composites of micro-crystal muscovite/UHMWPE (ultrahigh molecular weight polyethylene) wear prepared by pressing-sintering, the mechanical properties and erosion tests of the composites were carried out.The erosion resistance of the composites materials with the filling amount of 5% was the best ,and the erosion rate was about 30% lower than that of pure UHMWPE, and only about 0.08 times of 45# steel under the same condition. According to correlation analysis， the product of the impact toughness and the dynamic yield stress of the material had a good corresponding law to the erosion rate of the composites materials and the maximum of the product corresponded to the minimum of the erosion rate. The erosion wear rate of the composites was decreased with the increase of the material hardness, static and dynamic yield stress and energy absorption efficiency when the filling amount was not more than 5%. After the filling amount was more than 5%, no matter how the above performance parameters changed, the erosion amount increased.