The pasture’s productivity simulated by the third-order polynomial growth curve mathematicalmodel in different years in Maqu grassland coincided with the actualvalue. The simulation results show that themaximum growth rate is70. 2 kg/hm2·d and the minimum is1. 6 kg/hm2·d. Themonthlymaximum yield is2 042. 5 kg/hm2and theminimum is57. 6 kg/hm2. FromMay to September, the 10 days accumulated temperaturewhich is above 0℃increased 1℃, the pasture’s drymatter increased 2. 54 kg/hm2, and the amount of the precipitation increased every 1 mm in every 10 days, the drymatter increased 7. 33 kg/hm2, aswell as the sunshine duration increased every one hour in every 10 days, the drymatter increased 3. 83 kg/hm2. Considering the difference of the climate
tendency for different factors, the ten days precipitation is themain factorwhich influences the pasture’s yield, and the accumulated temperature in every 10 days plays the second role. The climate resources utilization rate in high production year is higher than that in the low production year.