Abstract: The water drive type curves and production decline law are the two important methods for dynamic prediction of reservoir engineering.Previous studies of these laws often take them as an independent approach，but they both have their own limitations in practical application:the water drive law describes the relationship among cumulative oil production，cumulative water production and water oil ratio， which lacks the concept of time；production decline law describes the change of annual oil production and cumulative oil production with time，which lacks the concept of water cut. Through the combination of the two methods，we can get water cut and cumulative water production in different time，oil production in different water cut，cumulative water production in different oil production, etc. Also, the methods above are used to predict the dynamic indices in Wuerhe oilfield and get good result