There is a deep layer of volcanic ash deposited soft soil in the site of Project 7 in Java，Indonesia，the natural moisture content is 115.4%，the pore ratio is 3.21，and the plasticity index is 25.5.Combining with engineering practice，we analyze the effect of soft soil foundation treatment and the reasons for the slow growth of bearing capacity.Taking soft foundation treatment in wharf yard area as an example，we calculate the post-construction settlement and consolidation degree by three-point method，and verify the effectiveness of this method .Through the analysis of vane shear test and plate load test data，we verify the applicability of the calculation formula of bearing capacity eigenvalue.The results show that the measured ground settlement is 1 587 mm to 2 496 mm，with an average value of 2 307 mm，and the reinforcement effect is remarkable.The consolidation degree of the foundation reaches 90% and the shear strength of the vane is greater than 20 kPa，which can meet the design requirements.