The ionic conductivity, relative viscosity, and solution enthalpy of LiNTF2 and NaNTF2 solutions in ionic liquid BMINTF2 have been measured. We observed that the conductivity decreased and the viscosity increased when the Li+ and Na+ salts were dissolved in BMINTF2. We also observed that the dissolution is an exothermic process with a solution enthalpy of approximately -18.07 +4.61 kJ/mol. The experimental results indicate that the Li+ ion may associate with multiple NTF2- anions in the BMINTF2 solution to form a solvated complex.