In order to propel the Third National Soil Survey (3^rd Survey for short) scientifically and efficiently and promote the development of soil science, this paper proposed, based on the summary of pilot practices of the survey, some scientific and technological supports for comprehensively carrying out the 3^rd Survey, including strengthening the technical system of multi-participation to ensure the professional standard of the survey, building a whole-process quality control system to ensure the credibility of the census data, and standardizing the compilation of survey results to ensure the high quality and practicality of the achievements..