Abstract: The recoverable reserve is an important parameter to appraise the effect of production increase measure.However, the effect of yield increase is a composite reflection of all kinds of measures,so the effect of individual measure is hard to be defined.It is provided in the paper one kind of equation set to solve the yield increase by individual measure.The equation set is superior since the recoverable reserve increase by individual measure at any pool or at any time can be calculated. The test data from oil fields in Huandong Branch Company show that the computational accuracy is up to 99. 8%.For its clear principle,easy calculation and high reliability, the calculation method is of the value to generalize and apply.