A new method called laser induced thermally-assisted vibrational fluorescence (LITVF) for combustion temperature measurement was proposed. The collisional relaxation model of the populations in the excited electro-vibrational states were established. By using light at 517.0nm to excite the transition of C2II1/2(v= l)-X2(v= 0), the LITVF spectra of Bad were obtained in the seeded premised liquified petroleum gas/air flame, from which the temperature were calculated. The results indicate that the accuracy of this method is σT=30K when BaCl is used as the seeded molecule.