Disproportionation of toluene with xylene high yields was studied over modified Y zeolite synthesized from kaolin of Vietnam. The effects of reaction temperature, weight hourly space velocity (WHSV) and of HZSM-5/HY ratios on toluene disproportionation have been investigated. The optimal condition of obtain the xylene high selectivity and the conversion of toluene is HZSM-5/HY, WHSV = h-1 and C.