Abstract: The design and construction of a demonstration monitoring well with a single hole depth of 350 m for multi-layer(four layers)groundwater was conducted in unconsolidated sediments in the Huanghe-Huaihe plain on the basis of the survey and study of multi-layer monitoring technique for groundwater.The work has made significant breakthroughs on the design of a single-hole multi-layer well hole,construction technology tubes and pipes and integration of groundwater automatic-monitoring technique etc.T...