The electron probe is indispensable equipment for assessment of rocks and ores in geological works. Since 1975, we analysed a lot of the ores and minerals of gold and silver from uiangxi, Henan, province et al, not only for appraising the content of gold, silver, electrum, miargyrite et al and observed its occur- rence, but also made a careful study of exist condition of the useful elements and useless elements in the ores and thereby provided foundationaI data for ore's synthetical evaluation. In this paper, a summarized account has been given the methods of qualitative analysis and quantitative analysis of gold- silver composite samples with electron probe x-ray microanalyzer. (1) "Z. A.F”method; (2) Method of quantitative analysis of standard samples of Au-Ag alloys; (3) Method of quantitative analysis of standard samples resemble mineral; (4) Method of quantitative analysis by proof read curve; (5) Method of quantitative analysis of silver sulphide mineral and its app- lication.