The applications of CO_2 development technology can actually and effectively enhance the oil /gas recovery rate, improve the oil reservoir environment and lift the quality of drilling.In addition,CO_2 also plays an important role in replacing hydrates,displacing water and extracting geothermal energy.Combining with CO_2 capture and storage technology(CCS),CO_2 development technology can also store CO_2 in underground space, thus slowing down global warming.