Abstract: In order to find industrial oil output standard to fit for the geology and reservoir engineering in Nanniwan oilfield.Based on the analogy and numerical value simulation,the results show that a well output still fit for the double decline curves after being fractured.To get an industrial oil output value,you must know the investment of a well,oil interest,the output value of reclaim a well etc.This value can fit for the production,calculate the reservoir,and roll development and the manager to make a strategic decision as well.