Aiming at the distribution characteristics of highway, the digital base station zoom-out system is used to realize single-cell continuous covering so as to overcome frequent signal switching, save base station resources and reduce networking cost; control the vertical distance between covering antennas and railways, control the hanging height of antennas and choose suitable covering antennas to improve covering effect; to the stations difficult to get electricity, use the remote power supply system to supply power directly through base-station generator rooms from composite optical cables or aluminum wires.