Yanchi County,Ningxia Hui Autonomous Region is located in the transition area from the arid steppe grasslands to the semi-arid region,and is one of the strong desertification areas in the criss-cross agricultural and grazing belt of North China.The pasture was subject to serious degradation in the past 50 years.This paper studies the human activities including indiscriminate exploitation,indiscriminate cutting firewood,indiscriminate reclamation and indiscriminate grazing,which greatly aggravate grassland degradation.Analyses indicate that the activities are resulted from the rapid growth and lower quality of population,low level of socio-economic development,irrational use of land resources and difficulty in policy implementation.To alleviate pasture degradation,we should seek solutions of the activities at first.