Based on data from meteorological records during 1951 to 2014 and field observations, this paper statistically analyzed the variation of precipitation and temperature over past 60 years and prospected their discernible overall trends. With the global warming, the average temperature in annual, summer and winter half year has been going up in the recent 20 years. The average temperature has been risen of 1. 2℃ since 1997, compared to 40 years ago. In contrast, besides the amount of precipitation in winter half year has the trend of decrease, the amount of annual total precipitation is inclined to show about 7-year of long periodic and 2-year of short periodic oscillations rather than a linear trend. Under the temperature rising while precipitation stable, and intensive of human activities, in particular, the development of large-scale of returning farmland to forests program, the soil moisture and groundwater will possibly continue decreasing. Finally, human living and ecological recovery will be affected by scarce of water resources in the hilly areas of the Loess Plateau. Thus, it is a long and key project to scientifically plan the farmland, fallow farmland, forest, grassland and trees(grass)species selection, forest density, etc. according to topography and geomorphology during the returning farmland to forests program in gully and hilly region in loess plateau.