Ionic liquid is a new kind of surfactant，and it is very important to investigate the physicochemical properties of ionic liquid（IL）aqueous solutions.In this work，surface tensions，densities，and viscosities of ［Bemim］［Cl］（1-methyl-3-benzylimidazolium chloride），［Cnmim］［Cl］（1-methyl-3-alkylimidazolium chloride， n=4，14，16），［BeiQu］［Cl］（N-benzylimidazolium chloride），［CmiQu］［Cl］（N-alkylisoquinolinium chloride， m =4，8）aqueous solutions were measured at different temperatures as a function of the concentration of aqueous solutions.The density of imidazolium-based solution is larger than that of isoquinolinium-based.The viscosity gets lower as the temperature increasing，and gets higher with the concentration increasing.At the same condition，with the same substitute of head group of cation，the surface tension of imidazolim-based solution is larger than that of isoquinolinium-based solution.