Abstract: More and more attention was paid to the attrition index of alumina in that aluminium producer with the increasing use of dry scrubbing systems for pot gas cleaning and point feeding of pots. In the course of sieving test, it cost a long time and produced a lot of dust.In this paper, use sieving and laser particle size methods to test aluminua′s attrition index and compared to two results. exploring work in laser particle size methods to test aluminua′s attrition index. Mass of experimental date proved that laser particle size method can testing aluminua′s attrition index,especially in plant with stable technics It can guide action in controlling production. Whether using laser particle size method to test the sample need in depth research when the sample is 45μm the content less than 10%and aluminua′s attrition index also less than 10%.