Abstract: TiCN-TiN compound cladding was prepared on the surface of the titanium alloy Ti-6Al-4V using the LC-LGN (laser cladding-laser gas nitriding) technology, where the 500 W pulsed YAG laser was taken as the irradiation source with the TiCN powder whose particle size is 3μm as remelting material and highly pure N2 which is coaxial with laser beam as shielding gas/nitriding element. The influence of laser parameters on the preparation of TiCN-TiN compound cladding was investigated experimently with XRD and micro Vickers. The results showed that the pulse frequency and scanning velocity are the main influencing factors on the formation of TiCN-TiN cladding when the laser power density and pulse width remain unchanged. It was revealed that the appropriate process parameters are the pulse frequency 15 Hz, pulse width 3.0 ms and scanning velocity 2.0 mm/s. Heavy oxidation is found in cladding process if the velocity is lower than 2.0 mm/s and the cladding will peel off due to low binding strength between it and substrate if higher than 2.0 mm/s. After such cladding treatment, the samples' microhardness HV0.2 of TiCN-TiN compound increase to about 14 GPa from 3.3 GPa without cladding, i.e., about 4 times higher than that of substrate.