A 1 835 a tree-ring chronologies has been established based on tree ring samples from Dulan region, Qinghai. Correlation function, Response function and response surface analysis were utilized to study relationship between chronology and climatic elements. The results showed that trees studied were mainly affected by climatic elements. 60% and above percent of growth variance can be accounted for by monthly mean air temperature and monthly to total precipitation, and the response to temperature is stronger than to precipitation. According to the relation of chronology and climatic elements, September～December mean temperature of Dulan region were reconstructed year by year. Using the data of reconstruction, the authors discuss the change of climate in Dulan area during last 2 ka, in particular mainly climatic events such as the Medieval warm period, the little ice age and getting warm of the last century, and make comparison between studies area and northern hemisphere.