Geocell is a kind of new construction material, which is widely used in the treatment of soft subgrades. On basis of the application of "prestressed concrete pipe pile + geocell" in the consolidation of the soft subgrades of passengerdedicated railways, the paper makes a detailed presentation of the features, working mechanisms, calculation methods and construction methods of "prestressed concrete pipe pile + geocell". The presented consolidation method has achieved good effects in improving the subgrade's loadbearing capacity, minimizing the subgrade's lateral deformation and controlling the soft subgrade's differential settlement. The paper provides a new concept for the treatment of soft subgrades.