The granular flow spallation target is one of the important candidates for Accelerator-Driven Subcritical Transmutation Device. However, this type of target will be faced with many important problems, one of which is the collective friction and wear of granules in the target loop. As granular flow spallation target material, tungsten alloy balls have excellent comprehensive properties. This paper introduces some important problems in the research of the collective friction and wear of granules, as well as some obtained preliminary research results of tungsten alloy balls about collective friction and wear. At last, a perspective for the collective friction and wear of tungsten alloy balls for future research has been provided, especially the dependence of the formation of new layer on experimental conditions and the collective friction and wear behavior under irradiation conditions. It is hoped that more researchers will participate in this research field and more new discoveries to look forward to in the future.