Abstract: Using the methods of linear tendency estimation and Mann-Kendall test, we analyzed change trend and abrupt change information of temperature and precipitation in Xinjiang over the past 30a with climatic observations from meteorological stations. The results were as follows: (1) the average annual temperature in Xinjiang over the past 30a presented an obviously upward trend, and the average annual precipitation showed the wave-growth trend; therefore, the overall climate became warmer and wetter, an evident abrupt change of the average annual temperature occurred in the mid-1990s at 0.01 confidence level, while the average annual precipitation did not show an obvious abrupt change at the same confidence level in the same period; (2) the average temperature in spring, summer and autumn increased significantly, but did not show an obvious trend in winter; abrupt change toward warming trend occurred in the autumn of 1994, abrupt change of the average temperature occurred in the summer of 1998, and abrupt change of the spring temperature occurred in the end of the last century or at the beginning of this century at 0.01 confidence level, while these characteristics did not show in winter; (3) the precipitation in spring, summer and autumn showed a decreasing trend, but the humidifier- tendency was significant in winter. There was no obvious abrupt change of precipitation in seasonal scale. These results could enrich basic materials of climate-change research in western arid region and provide a scientific basis for decision-making of the impact of climate change on the socio-economy in Xinjiang.