Accounting of CO_2 emissions is the basis word for controlling GHG emission and dealing with climate change. Based on the energy balances of Ningxia and the CO_2 emissions accounting method recommended by the 'Provincial Greenhouse Gas Inventory Guide (Trial) ',the paper accounted and analyzed the CO_2 emissions of Ningxia in 2005-2012. The CO_2 emission quantities based on the energy balances was lower than the accounted result based on the total energy consumption. The main reason for this was eliminating the energy consumption to material without oxidative combustion which can make the CO_2 quantities overestimate 50% based on energy balances. Thermal power caused more than 50% CO_2 emissions of energy consumption,and the raw coal was the largest energy varieties of CO_2 emission. The big scale of external power transmission caused into the CO_2 emissions increased sharply recently,and made Changes without synchronization between CO_2 emissions and energy consumption.