Abstract: According to the National Climate Observatory Xilinhot 2007 ~ 2009 growing season (from May to September) continuous turbulent flux and radiation monitoring data, combined with synchronous meteorological data, using linear regression, the ratio energy balance method in different weather conditions in the region the energy balance closure was analyzed, results showed that: sunny growing season, the energy balance ratio of 99.0%, average daily energy balance ratio of 66.7%; growing season, the energy balance ratio of 110.3% cloudy days, effective energy is less than turbulent energy, average daily energy balance ratio of 64.3 %, there is the phenomenon of energy is not closed.