5) The project is in bad natural conditions and needs higher level of process construction. There is a long time in winter for construction in this section, the temperature is low, effective time for construction is short, it is require special handling because of bad geological conditions in part of the construction area, plus, construction process is complex and construction is difficult because of crossing state road 210, several existing lines and much special bridge structure. Draw up targeted construction design according to different situations before construction; reduce project risk from the aspects of the construction design and management.