The long-chain ionic liquid (IL) hexadecyl-4-aza-1-azoniabicyclo[2.2.2]octane bromide was used as a template to prepare the hexagonally ordered siliceous mesoporous molecular sieve MCM-41 as well as the disordered mesoporous molecular sieve designated as KIT-1. The synthesized products were studied via X-ray diffraction (XRD), Fourier transform infrared (FTIR), N₂ adsorption-desorption analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Also, the surface area (BET), pore volume, and pore diameter (BJH) are determined. These kind of ILs which have 1,4-diazabicyclo[2.2.2]octane (DABCO) in their structures, were prepared with an easy method. When the two templates, cetyltrimethylammonium bromide (CTAB) and IL, have the similar structures, MCM-41 mesoporous molecular sieve produced with more ordered, uniform mesoporous channel and high surface area in comparison to without IL. When just IL used instead of CTAB, the KIT-1 with non-uniform mesoporous was obtained. Here we prepared the KIT-1 mesoporous molecular sieve with IL without CTAB. Also, using dual template CTAB and DABCO based IL leads to increase the pore walls of products. It seems, using dual template with changing IL structures in fabricated of molecular sieve provide new opportunity to design targeted adsorbents and catalysis.