The project team of China Geological Survey “Land Trial Production of Natural Gas Hydrate in Sea Area” has constructed a drilling test site in the coastal beach area of Dongying City, Shandong Province. The foundation soil of the site is typical silty clay in the Yellow River Delta, which has the characteristics of micro-vibration liquefaction. By comparing the advantages of cost, construction period, environmental protection and applicability, the project team chose the construction scheme of lime-soil cushion and strictly controlled the construction quality. Lime-soil cushion can form effective water-proof layer, isolate groundwater rising channels and surface water seepage channels, avoid the causes of micro-vibration liquefaction, and eliminate the seepage of construction waste water in the site. At the same time, static compaction was used throughout the backfilling construction to avoid the upward migration of pore water and micro-vibration liquefaction effect of soil. The backfilling area is divided into heavy-load area and light-load area. Different backfilling schemes were adopted, which not only met the bearing capacity requirements, but also saved costs. The backfilling schemes have achieved good construction results, ensuring the smooth operation of the test site.