A testing method for testing a flow controller with high accuracy by shortening the time required for the test including the waiting time as much as possible. A flow controller (4) under test and a flow controller (5) used as a reference are arranged in order of mention in series from the upstream side in the channel through which a fluid the flow of which is to be controlled flows. The valve of the flow controller (4) is substantially fully opened into to bring it to a flow uncontrolled state, and the flow of the fluid is controlled to a predetermined flow by the flow controller (5). It is judged whether or not the actually measured flowmeasured by the flow controller (4) is within a predetermined range of the actually measured flow measured by the flow controller (5). ® KIPO & WIPO 2009
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