The present state of ecological environment is evaluated in the area of plentiful and coarse sand on the Loess Plateau in China with water and soil conservation effect coefficient, the difference between rainfall and evaporation and primary production capacity as the evaluation Factors. At the same time, based on regularity of climatic change for last 40 years, and the forecasting result of air temperature and rainfall for next 50 years with GCM Model of National Climatic Center, the future ecological condition in the zone is viewed. It put forward a proposal of ecological environment construction, adjusting agricultural structure: planting trees where to be good for growing trees, planting grass where to be good for growing grass and developing sand production where to be not good for growing plant. These proposals are effective ways to change the current condition on the frailty of ecological environment, lower production level, resources of unreasonable use and undeveloped potential production.