Abstract: This paper mainly studies the ultrafine effects of the miner al ultrafine powders in the property assessment index system of ordinary powders , heteromorphic powders and functional powders. The common testing methods are a lso discussed. It has been shown that the granularity, purity, surface property and micro-particle mechanics are the four major aspects to evaluate the ultrafi ne effects of mineral powders. The mechanical behavior, shape index and unsticking percentage of heteromorphic powders and ordinary powders are essential criteria. More perf ect method for describing the essential behavior of these powders is requested so that the special functions of the heteromorphic mineral powders can be created and designed.