Abstract: This paper introduces an improved deep plate loading test. Based on a practical engineering case of Ningbo rail transit, the test of cobbles in ⑧_3b layer is carried out, and during field testing, the single pile vertical compression static load test method is employed for loading tests. The measured characteristic value of foundation bearing capacity is 883 kPa, which is approximately 1.5 times the revised value in the geotechnical investigation report, indicating that the characteristic value of the foundation bearing capacity provided in the geotechnical investigation report is relatively conservative. The test results can provide references for investigation and design personnels, and also accumulate experience for geotechnical engineering investigation in Ningbo Area.