We theoretically present the results for a scanning interference tunneling process between a metallic tip and a heavy fermion system.The density of states (DOS) and the differential conductance at zero temperature under different c f band hybridizations,as well as the interference Fano ratio strength in the heavy fermion system,are calculated.It is found that the hybridization strength gives rise to the splitting effect in the DOS around the Fermi energy.Also the interference Fano ratio strength makes the differential conductance characteristics strongly asymmetric.