The paper particularly discusses the key technology of
cash - flow model applied in our country ’s economic
evaluation and with financial cost accounting rule of
petroleum company ,the paper presents structure of economic
model and cost accounting method. The paper thinks that the
key to use cash - flow model is to establish exact economic
model and choose appropriate oil production forecasting
model. At the same time ,the paper indicates that because of
effect of many parameters forecasting , cash - flow model
method cann ’t adapt to our country ’oil fields during
calculating economically recoverable reserves. so it is very
important to study new method to resllve this question.