By using tin tetrachloride pentahydrate and lanthanum nitrate as raw materials, Lanthanum stannate powder was prepared by chemical coprecipitation method with sintering temperature of 920℃. And then Ag-La₂Sn₂O₇ electrical contact composites were prepared by high-energy ball milling and sintering process. The effects of sintering temperature, sintering time and surface modifier on the morphology and phase of La2Sn2O7 powder were investigated, and the physical properties of Ag- La₂Sn₂O₇ were analyzed. The results showed that La₂Sn₂O₇ powder with mesoporous structure was obtained with sintering temperature of 920℃, 2h. With the pressure of 1200MPa and sintering temperature of 900℃, 6h, The properties of Ag- La₂Sn₂O₇ showed good electrical resistivity and hardness. After the hot extrusion process, Ag- La₂Sn₂O₇ electrical contact material had undergone large plastic deformation, in this process, the formation of fiber-like structured distribution of the particles observed contributed to obtain lower resistivity.