With adaptive feedback system based on Genetic Algorithm(GA),selective excitation of coherent anti-Stokes Raman scattering for dibromomethane was successfully achieved. The optimal pulses were characterized with second harmonic generation frequency-resolved optical gating(SHG-FROG)and displayed as trains of sub-pulses with negative chirp. This experimental demonstration of selective excitation between neighboring levels indicates that coherent control has a great potential in the improvement of sensitivity and is a meaningful method in the complex molecular system.