The invention relates to a method for testing a compensation flow rate. The method mainly solves the problem that existing measurement manners cannot achieve accurate measurement. The method is characterized by comprising the steps that (1) a constant flow pump is not turned on, and a tubular column flow rate L is tested; (2) the constant flow pump is turned on, the flow rate of the constant flow pump is L0, and a tubular column flow rate L' is tested; (3) a tapered tubular column cross sectional area is obtained through computation; and (4) the flow rate is calibrated by the calibrated cross section area. The method for testing the compensation flow rate is characterized that through addition of the compensation flow rate, a measurement error caused by cross section changes of an oil tube and a casing can be calibrated in non-afflux measurement; and errors caused by non-alignment of instruments could be eliminated.