This paper introduces the main materials of refractories used in flue of CDQ in China,analyzes the main causes of brick damages of partition wall from microscopic and macroscopic angles.From the application and test of mullite-silicon carbide brick,mullite-andalusite brick,silicon nitride bonded silicon carbide brick and newly developed low internal stress mullite-andalusite brick are compared and analyzed.It is pointed out that improving the thermal shock stability and good abrasion resistance of the partition wall bricks can satisfy longevity,and a new type of high temperature and low internal stress mullite-andalusite brick has the advantages of very low internal stress,excellent thermal shock stability,good abrasion resistance and low bulk density and so on,which can meet the longevity requirement of partition wall refractories in CDQ.