The commercial application of a new type HAT- 099 disproportionation catalyst in the disproportionation unit was introduced. The result showed that the catalyst strengthened the transalkylation reaction,could handle raw materials with high heavy aromatic content while maintaining optimum conversion rate and selectivity,which therefore reduced production cost requirements of paraxylene. Proposals were also raised for giving full play to the ability of the catalyst in handling high C10 A.