It is important to develop new tree-ring chronologies in this region,in order to recognize climatic variation in the past on the north of west Sichuan. Fir (Abies faxoniana) tree-ring samples were collected from the north of West Sichuan. West Sichuan is located at the boundary between the Tibetan Plateau and the Sichuan Basin. Its climatic system is complicated because it is influenced by southeast monsoon, southwest monsoon, and the Tibetan Plateau. The two samples sites are Rejigou region (100°49'N, 32°16'E; 3680m a.s.l.) and Rewugou region (103°23'N, 32°17'E ; 3530m a.s.l.), which recollected from the north of Tibetan Qiang Autonomous Prefecture of Ngawa. Tree-ring samples were prepared, cross-dated and measured following conventional procedures. The calculation shows that the tree-ring width was significantly correlated with temperature, and the chronology had the highest correlation (r = 0. 74) with mean temperature from July to August. Based on the analyses, we reconstructed July to August from 1686 to 2010. The reconstruction captures 54. 6% of the instrumental temperature variance. In the past 325 years (1686 ~2010),there were 6 cool periods (1691 ~ 1704,1768 ~1797, 1837 ~ 1852, 1888~ 1898, 1907 ~1932,and 1963 ~1996) and 6 warm periods (1705 ~1767, 1798 ~1814, 1823 ~ 1836, 1853 ~1866, 1874~1887, and 1950 ~1962). The longest warm period is 1705 ~1767 (63 years),which annual mean temperature is 0. 54°C higher than average temperature and the longest cool period is 1963 ~ 1996 (34 years), which annual mean temperature is 0. 48℃ lower than average temperature. According to analysis of temporal and spatial correlation, it indicated that the reconstructed series with good temporal and spatial representation. Our reconstruction was validated by other temperature reconstructions from the surrounding area, e. g. the temperature reconstruction from June to August, the annual temperature reconstruction and our reconstruction shows that there is a significant warming trend since 1980s. Glacier advances, e.g. when the glacier is relatively stable or progressive stages form 1900s to 1930s, our reconstruction shows a cool period (1907~1932) and retreats, e.g. retreats show that the region is a large range of snow disaster prone areas form 1960s to 1990s which caused serious losses to farmed livestock.