Abstract: Mesoporous molecular sieves AlMCM41 with 〖ＷＴＢＸ〗n〖ＷＴＢ１〗(SiO2)/〖ＷＴＢＸ〗n〖ＷＴＢ１〗(Al2O3) ratio being 20, 50 and 100 were prepared. As proved by Xray diffraction (XRD) patterns and the N2 physical sorption, the assynthesized AlMCM41 exhibited typical hexagonal structure, large surface areas and narrow pore distribution. The performance of HAlMCM41 as catalyst for tertbutylation of pcresol with methyl tertbutylether (MTBE) was then investigated. The effects of temperature, weight hourly space velocity (WHSV) and the feed ratio 〖ＷＴＢＸ〗n〖ＷＴＢ１〗(MTBE)/〖ＷＴＢＸ〗n〖ＷＴＢ１〗(pcresol) on pcresol conversion and product selectivity were examined. The results showed that mesoporous HAlMCM41 molecular sieves (n-SiO2)/n-Al2O3) = 20) is an efficient catalyst with high activity, selectivity and stability for the synthesis of 2tertbutyl p-cresol from p-cresol and MTBE by tertbutylation.