Adding carbide-formation elements into the high-carbon-equivalent FeCSiB molten pool induced by laser cladding or laser alloying is favorable of the formation of high wearable metal matrix composite coating with multiple carbide particles reinforcement by in-situ synthesizing and with strong metallurgical bond to the substrates. They play different roles in promoting the nucleation and growth of the reinforcement carbides, among which Ti is the most important element for particle nucleation. The adding combination of the strong carbide formation element (Ti+Zr+Mo+WC) was optimized. Tribological tests and application checks in typical key parts approve that the laser produced composite coatings reinforced by in-situ particles demonstrated excellent wear resistance and coupling capability. The above concept on producing in-situ synthesized particles reinforced composite coatings has been successfully used in laser surface strengthening of nickel-base alloy.