Research conclusions：From the statistical analysis and study on the measured bearing capacity of the soft subgrade of Suinning-Chongqing Railway, it is concluded that the reinforcement and design of general flexible foundation, such as embankment and field plateau, should consider the three aspects, namely embankment stability, post- construction settlement and subgrade bearing capacity, and the allowable bearing capacity value of flexible foundation can be in properly wider range under the premise of meeting the requirements of stability and post-construction settlement. The checking formula and the suggestions to correction coefficient of bearing capacity of flexible foundation are also given preliminarily.