The Si powders of different contents are added into the TC4 powders and the laser cladding deposition experiment is conducted. The influence of induction heating on the microstructures of samples is investigated. The results show that, as for the as-deposited samples without the introduction of induction heating, Si can effectively refine the columnar crystals and thus their widths decrease from 285.5 μm to 12.1 μm. In contrast, after the introduction of induction heating, the widths of the columnar crystals do not change, but part of the columnar crystals in the direction of deposition are broken and thus the throughout growth does not form. In addition, the crystals consist of a large number of α colony, and the irregular and dispersed silicide precipitations occur in α lamellar.