According to the survey data from the Sunan county located in Qilian Mountains of China,(a) the economic behavior of herdsman is explored and(b) some economical models are carried out to analyses how the herdsman make their decision as well as th.

Based on survey data on households of herdsmen and the sustainable development of stockbreeding and grassland,the status of the herdsman household management and change condition of grassland were analyzed,the essential feature,income and disbursement constitution from management of households of herdsmen and change characteristics of the grassland were made clearly.