A cladding layer 55Ni-35Ti-10Si (at.%) was synthesized on copper using laser cladding in this paper. It was composed of two kinds of microstructures. The microstructures of the cladding layer were characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). According to the analysis results, phases appeared in upper layer should be Ti solid solution+Ni₃Si and the morphology was dendritic. The under layer was composed of Ti solid solution+ Cu solid solution and the morphology was cellulate. The crystal growth in solidification process was analysed using a modification model which is combined Kurz-Giovanola-Trivedi (KGT) model with Lipton-Kurz-Trivedi (LKT) model. Mechanism of cladding layer stratification was studied by thermodynamics. Microhardness of cladding layer was tested. The average hardness of upper layer and under layer were 800HV and 220HV, respectively. The synthesis of under layer increased the stability of cladding layer.