Abstract:The Two-Step Sintering processed of AgSnO2 electric contact materials was studied. By the discussion for the effect of pre-sintering temperature, pre-sintering time and heating rate on the properties of AgSnO2 electric contact materials, we confirm the optimal pre-sintering temperature and pre-sintering time are 700℃ for 0.5h and the beat heating rate are 15K per minute before pre-sintering and 3K per minute after pre-sintering. By the comparative study on properties and microstructures of AgSnO2 electric contact materials prepared by two step sintering process and the traditional one-step sintering process, The results indicate that two-step sintering processed AgSnO2 electric contact material possesses improved sintering activity of AgSnO2 power and promotes its densification in the high-temperature-sintering stage which eventually improved the microstructure and performance of AgSnO2 electric contact materials.