TiO2 doped SnO2 nano powder used for Cu matrix electrical contact materials was prepared by a sol-gel method. The transformation process of the doped SnO2 precursor during heating was analyzed by TG-DSC technique. Then, phase analysis and particle size calculation of the doped SnO2 powders calcined at different temperatures were carried out by XRD, and the microscopic morphology of the doped SnO2 powder was observed by TEM. Finally, the doping result of SnO2 powder was evaluated by analyzing the change of the lattice parameter d value. The results show that nanometer SnO2 can be successfully doped by TiO2 using the present method. The doped SnO2 calcined at 500 oC is spheroidal in shape, and about 10 nm in diameter. It can entirely meet the need of Cu matrix electrical contact materials.