Five imidazolium Gemini surfactants were synthesized by four chemistry reactions using imidazole and bromide alkyl as the main starting materials. The NH group of the imidazole was protected. Their structures were identified by IR and 1H NMR and their properties were measured. The surface activity data of these surfactants （C10-2-C10, C12-2-C12, C14-2-C14, C14-4-C14 and C14-6-C14）are as follows: CMC : 2.7×10-4, 2.4×10-4, 2.0×10-4, 3.3×10-4 and 3.9×10-4 mol/L; γcmc: 30.60, 30.55, 30.51, 36.32 and 37.41 mN/m; the max values of contact angle on the quartz：70°, 73°, 75°, 72° and 68°; the max values of foam height: 87, 99, 125, 186 and 231 mm; t0.5 : 218, 608, 1157, 2329 and 2770 s. The surfactant C14-2-C14 shows the highest surface activity and the lowest wetting property for quartz. The properties of foams of C14-6-C14 are the most stable among the surfactants. When the hydrophobic chain increases, the surface activity, the efficiency of reduction in the surface tension of the water (pC20 ) and contact angle increase; but while their spacers increase, the physical and chemical parameters above decrease.