Abstract: This paper presents a case history of an airport construction project for quality control methods and compaction indices of sandy gravel soils. Typical sandy gravel samples were collected and classified as the well graded rounded sandy gravel from the grain size distribution tests. It is determined that this material can be used as the fill material for the runway and its associated areas. Based on the grain size distribution analysis results and analytical approaches, the density of the sandy gravel is commonly determined by the in-situ solid ratio method (water preplacement method). This is paper discusses the influence of the test pit diameter on the accuracy of the density of the soil test by the water replacement method. Under the sample compaction parameters (loose thickness of soil 35~40 cm and vibratory compaction of 14 passes) and a test pit diameter of 60 cm, the QA-QC acceptance criteria for the compaction of runway area using sandy gravel soil are: dry density greater than 2.20 g·cm^-3and the solid ratio greater than 85%.