Abstract: The main characteristics of soft soil in Pearl River Delta are introduced. Based on design of treatment of a soft soil foundation in Zhuhai, the calculation of consolidation degree , check computations of loading stability and soil strength increment are depicted. The method for computing average consolidation degree in the relevant criterion is revised, and the results of settlement are improved. According to the observations and tests after the completion of construction, the revised results are validated. Finally, the observations indicate that the design is successful and it can be a valuable reference for the similar projects.