Abstract: Tree-ring growth responses to climate change provide not only crucial information to evaluate the response of forest ecosystem under global change,but the basis for dendrochronological research. Along an elevational gradient,tree ring samples of Larix sibirica from 4 sites at the southern slope of the Sawuer Mountains were collected and the chronologies were developed. The characteristics of chronologies and their responses to climate were also analyzed. The results showed that the high mean sensitivity and consistency suggested their potential for climate reconstruction. Generally,mean sensitivity,standard deviation and signal-noise-ratio increase with elevation decreasing. In the four chronologies,the mean sensitivity and percentage of missing rings of HGD is the highest,illustrating the high potential for climate information. At the same time,the first autocorrelation coefficient which reflected the lag effect decreased with the decrease of elevation. With the decreasing altitude,the positive correlation coefficient between tree-ring width index and growing season temperature decreases,even to negative. With the decrease of altitude,the positive correlation coefficient between tree ring width index and growing season temperature decreases,or even negatively. The correlation coefficients between tree-ring width index and moisture conditions（precipitation,relative humidity and water vapor pressure） change from relation to significantly positive correlation. The elevation at about 2 000～2 100 m is the key transition zone for the response of tree-ring width to climate. Treering width was dominated by annual precipitation（from July in the previous year to June in the current year）and the mean temperature in the growing season of the current year,showing its potential for regional drought index reconstruction.