CNTs-SiC-Ni composite cladding coating were fabricated by laser cladding with mechanical alloying modified composite powders. The effects of mechanical alloying on the microhardness and antiwear properties of composite cladding were studied. The results show that with the increasing mechanical alloying speed, the encapulsated area on the nickel particle grows at the exponential rate and keeps constant on the 350r/min mechanical alloying, the nickel powder, SiC particle and CNTs mix evenly. When the mechanical alloying speed is 300r/min, the fine core-shell (CNTs-SiC)/Ni composite particle is obtained, the microhardness of the cladding gets the peak value, the mass wear of the cladding has the minimium value.