Global warming caused by greenhouse gases emissions may lead to severe environmental and social problems. In this paper,an evaluation system for greenhouse gases(GHG) emissions to the level of global benchmarking is proposed using the methods recommended by the 2006 IPCC Guidelines for National Greenhouse Gases Inventories and the Chinese Guidelines for Provincial Greenhouse Gases Inventories,and analyzed the dynamic variation of GHG emissions of Xianyang City and evaluated their emissions degrees. The results show that,GHG emissions in Xianyang City rapidly increase from 1253.21 * 10~4 t to 5531.06 * 10~4 t during 1995 to 2011,with an annual average rate of 9.72%. The growth rate of GHG emissions decrease in the order of cement(21.34%) > energy(9.62%) > waste(7.90%) > agriculture(2.45%). Energy GHG accounts for the majority of GHG components(84.73% ~ 91.81%), followed by cement GHG(1.46% ~ 8.55%), agricultural GHG(3.11% ~ 9.32%), forestry carbon sequestration(- 0.53% ~ - 2.36%), and waste treatment GHG(1.31% ~ 8.39%). It is proven that,the increases of energy consumption and industrial manufacture are the primary causes of GHG increases of Xianyang City. GHG emissions per ten thousand Yuan decrease wavelike,with an annual average rate of 4.53%. GHG emissions per capita,per unit area and GHG emissions index increase rapidly,with an annual average speed of 9.31%,9.72% and 9.48% respectively. Over the past 16 years,the grade of greenhouse gases emissions of Xianyang City increases continually from a low level(Ⅰ_c) to an above-average level(Ⅱ_c), which is four sub-grades higher than the target set for the control of global climate warming(Ⅰ_b). Therefore,GHG emissions reduction should be of high priority in pollution control.