Freeze-thaw erosion is an important research topic to the north regions of China, and however, it is also an easily neglected object. For the exploitation and construction projects, soil and water loss is usually not thought to occur in winter because of ceased construction work, less stage disturbance, snowfall dominated precipitation, and seasonally disappeared runoff. We carry out a fixed-point erosion monitoring by the drill rod method on both excavated slope and filled slope in winter in order to investigate the influence of freeze-thaw erosion on exploitation and construction project. Results from monitoring and investigation show that more serious freeze-thaw erosion occurs in the stage. The bigger harm is mainly found on excavated slope and filled slope. The influence on the flat factory area is less (less influence means less harmful, not a small quantity of erosion). This paper briefly discusses freeze-thaw erosion in exploitation and construction project. It may be worse in representation, but it provides a reference to future works since it still explains some problems partly.