Objective To evaluate wear resistance and hardness of three kinds of new composite resins. Methods Three kinds of new composite resins, Solidex， Spectrum, FiltekTM Z350, were tested. Enamel as control group. A refited MG- 200 wear machine was used in this study. Scanning electron microscope（SEM）was used to observe the friction surface of each tested material. Hardness of each tested material was determined by Vickers indentation technique. The data of wear and hardness were analyzed by Mann-Whitney test and 1- way ANOVA. The relationship between the hardness of the composites and the amount of wear of them was determined by a regression analysis method. Results FiltekTM Z350 showed the lowest volumetric wear and highest Vickers hardness in the composites （P0.05）. Significant relationships were observed between the hardness of the composites and the amount of wear of them （r=- 0.968 6）（P
