Abstract: In order to objectively grasp the microclimate and air quality of Tianshan Grand Canyon National Forest Park in Xinjiang,and promote the tourism development of Urumqi,the air temperature,relative humidity,PM2.5,PM10,SO₂ and NO₂ mass concentrations were monitored in Tianshan Grand Canyon Forest Park and an urban area of Urumqi from August 2019 to July 2020 by real-time online monitoring method.The results showed that the annual average temperature of Tianshan Grand Canyon National Forest Park was 4.7℃lower than that of the control point,the temperature of Tianshan Grand Canyon in summer was 7.7 ℃lower than that of the control point,and it was slightly higher than that of the control point in winter.The average relative humidity of Tianshan Grand Canyon National Forest Park（61.63%）was 13.71 percentage points higher than that of the control point（47.92%）.The mass concentrations of PM10 and PM2.5 remained at a relatively stable level throughout the year,and the annual average values were 4.00 and 0.83μg·m^-1,respectively,which were 18.37%and 27.66%times of the control points.In terms of seasonal variation,the order of mass concentration was winter＞autumn＞spring＞summer.The annual average concentrations of SO₂ and NO₂ were 1.45 and 9.80μg·m^-1,which were only 16.27% and 31.60% of the urban monitoring points.In terms of seasonal variation,the order of mass concentration was winter＞spring＞autumn＞summer.