Abstract: High-Si coating was deposited on low-silicon steel substrate using laser to clad Fe-Si mixed powder onto that. The effects of laser scanning speed on the macro-morphology, phase composition, microstructure, chemical composition and microhardness of the laser cladding were investigated. The result showed that the cladding consists of α-Fe(Si), γ-Fe(Si) and FeSi2 phases at different scanning speeds. The microstructure of the cladding tends to grain refinement with its inhomogeneity improved with increasing scanning speed and, meanwhile, average microhardness increases due to decreasing dilution ratio in the cladding as arising from its decreasing thickness. As a result, a pore and crack-free cladding with metallurgical bonding to the substrate is formed on low-silicon steel surface by adjusting the laser scanning speed of which the optimal one is 2.5 mm/s.