Steam-stable and hexagonally ordered mesoporous aluminosilicate (MCM-41(h)) has been prepared via neutral-cationic route using butylamine and cetyltrimethylammonium bromide as co-templating agents. The mesostructure of the synthesized material could retain its integrity after exposure to 20% (v/v) water vapor in Ar at 1073K for 4h. It was believed that the steam stability might be related to the thicker framework walls, the higher condensation of surface silanol groups and the presence of some arrangements of zeolite five-ring subunits in the framework walls. In catalytic cracking of 1,3,5-triisopropylbenzene, the MCM-41(h) showed relatively stable activity under equivalent steaming conditions in comparison with the conventional AlMCM-41 material.