The new railway has a total length of 30km, of which 5km is selected for roadbed design. This design includes subgrade body design; Calculation of subgrade excavation and filling volume; Layout and design of subgrade drainage facilities; Subgrade slope protection design; Stability analysis of subgrade slope; The selection of subgrade retaining and retaining structure design; Design of foundation treatment in soft soil area. Draw the cross section diagram of typical subgrade, write the design specification of subgrade, compile the calculation table of earthwork, draw the design drawing of retaining structure and the design plan of subgrade protection. Will own three years to learn the knowledge synthesis, to own a leak to make up for the deficiency.