Based on the meteorological data from meteorological station in Baota District,Yan'an City from 1980 to 2007,climate change at the beginning is analyzed and the change of climatic productivity is calculated by using Thornthwaite Memorial model.Results show that rainfall amount decreases by 2.73 mm/a and temperature increases by 0.05 ℃/a.Wind speed and relative humidity are decreasing and sunshine hour is increasing.Climatic productivity in Yan'an area is increasing but not significant.Rainfall is an important limiting factor for climatic productivity and the "warm-wet" climate is the most beneficial for crop climatic productivity.