The owners of the Hainan Dongfang gas field have scared off several foreign giant suppliers by demanding only a replacement of the co2-removing solvent formula to meet the targets of a 20% increase in production capacity and a 20% reduction in energy consumption. After careful aspen calculation, it can be realized. A plan of replacing the internals of the column and the solvent formula is put forward. Design, procurement, overhaul, parking construction took a year to bring success: capacity increased by 22% , energy consumption reduced by 23% , export CO2 Index 400-800 ppm.