Currently，the common understanding of reserve-production ratio is contrary to the actual production in oilfields.To understand the relationship between reserve-production ratio and stable production，we analyze the existing views and their background and basis.We select38out of SINOPEC’s200producing oilfields and make a statistics on reserve-production ratio according to the type of oilfields.Their hypothetical reserve-produc-tion ratio at the end of stable production is also deduced.The results show that the relationship between reserve-production ratio and stable production depends on the development phase of an oilfield，oilfield type and the development policy.Whether an oilfield can keep stable production cannot be judged only from reserve-produc-tion ratio.