The ANPP sequences of desert steppe,typical steppe and meadow steppe in Inner Mongolia were reconstructed by using the CENTURY model and high - precision sequences of changes in temperature and precipitation in West China from A. D 1 to 2000. The period features of ANPP for different steppes and their relationships with annual temperature and precipitation were investigated with the application of Pearson correlation analysis, continuous wavelet and cross - wavelet. The results indicate that: (1) The long - term fluctuations of ANPP for three types of steppe were generally similar. Significant low value period appeared during the Little Ice Age of Wei - Jin and Ming - Qing Dynasties,while high value period lasted for about 600 years from A. D 600 to 1200. (2) The fluctuation changes of ANPP for different steppes were different. The productivity of typical steppe was in the middle with the largest fluctuation range; desert steppe was the lowest with middle fluctuation range,and meadow steppe was the highest with the least fluctuation range. (3) The ANPP of these three types of steppe all had oscillation periods of around quasi - 280 years and quasi - 60 years. Meanwhile,a oscillation period of about quasi - 150 years existed in meadow steppe. (4) Precipitation and temperature had a significant effect on grassland ANPP,but in different types of grassland effects were different. The productivity of typical steppe and desert steppe were mainly determined by precipitation while for meadow steppe case,it was determined by the combined effects of precipitation and temperature.