Based on a study of the quality problem that exists in sample analysis for 27 projects of regional geochemical survey,the author holds that the unsatisfactory analytical quality is mainly attributed to loose understanding and implementation of the quality control and quality monitoring stipulated in DZ/T0167-95 Standard. In the light of the characteristics of sample analysis in regional geochemical survey, this paper puts forward for colleagues' reference some understanding and opinions concerning the selection of analytical techniques,the aim and types of quality monitoring,and the differentiation and processing of systematic errors.