Abstract: Antiwear is the most important characteristics for top roller bearing. It maintains yarn quality in textile industry. Development of outer race of top roller bearing by powder hot forging is an advanced technology in bearing industry. Cold working and hot working technology of the powder metallurgical bearings are presented. Through analyses of the metallographical examination and electron-microscopic scanning, the theoratical description of wear resistance mechanizm is given. Wear trial between bearings made of steel and powder metallurgical bearings has been carried out in the spinning field for 42,000 hrs. The results have shown the life expectancy of powder metallurgical bearings doubled that of bearings made of steel. Repeated practice have also shown the advantage of powder metallurgical bearings over the steel bearings in the respect of labor, material utilization, cost etc.