Ti-6Al-4V/B/C mixed powder which pre-pasted on a Ti-6Al-4V substrate was scanned by a 500 W pulsed YAG laser to induced in situ formation of a titanium composite coating contained TiBx and TiC ceramic reinforced phases. The influences of laser processing parameters including pulse frequency (PF),pulse width (PW),laser power (P) and scanning speed (V) on the microstructure and properties of the coating were investigated. Microstructure,phase components and micro-hardness of the coating were analyzed by optical microscopy (OM),scanning electron microscopy (SEM),X-ray diffraction (XRD) and micro-hardness tester respectively. The optimized processing parameters of a single path laser scanned specimen in this case are as follow:PF=15 Hz,PW=3 ms,laser line energy about 11 J/mm. Multi-path laser scanned specimens were formed under the above processing parameters. TiB and TiC ceramic were formed evenly reinforced in the matrix of Ti-6Al-4V with the morphology of needle,tiny dendrites and disperse particles. No crack and porous are found in the single and multi-path specimens. Metallurgical bonding is formed between the coating and the substrate. The maximum micro-hardness of a multi-path layer is up to 800 HV,which is 2 times of that of the substrate (394 HV). The wear weight loss of a multi-path laser scanned specimen formed under the optimized processing parameters is 21% less than that of the substrate.