A method for experiment using a scientific phenomenon evaluation apparatus in which at least two reservoirs constituting an inlet and an outlet communicate with each other through a minute channel having a sectional area of 1 mm.sup.2 or less, the method comprising the steps of a preparatory step of removing air from the minute channel in advance by causing an inactive dummy liquid which does not react with an experimental liquid for performing an experiment to flow into and fill the minute channel, the preparatory step being performed at least one time and an experiment step of supplying the experimental liquid to the reservoir on the inlet side and feeding the experimental liquid into the minute channel by using a liquid feed device to cause the dummy liquid filling the minute channel to flow toward the reservoir on the outlet side.