The effects of temperature and concentration of CTAB added into imidazolium-based ionic liquids (C_nmimBr, n = 10, 12, 16) solution were investigated, and surface active parameters and aggregation of these surfactants were explored by surface tension and conductivity measurements, which include critical micelle concentration (CMC), maximum surface excess concentration (Γ_max), minimum surface area per surfactant molecule (A_min), surface tension at the CMC (γ_CMC), adsorption efficiency (pC₂₀), and surface pressure (Π_CMC), as well as thermodynamic parameters of micellization. The results were reported in the presence of CTAB at 0, 4, 8, 12, and 16 mM for C₁₀mimBr, 0, 0.2, 0.4, 0.8, and 1.2 mM for C₁₂mimBr, and 0, 0.04, 0.08, 0.12, and 0.16 mM for C₁₆mimBr in mixed systems. The increase of the CMCs with temperature were observed, while pC₂₀, Γ_max, and standard entropy of aggregation were decreased, indicating that the aggregation is an enthalpy-driven process within the temperature limits of the present study. FT-IR and ¹H NMR measurements revealed that the changes mentioned above were controlled by the electrostatic effect and hydrophobic interactions between CTAB and ILs molecules.