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Study on the movement of conducting particle is useful for managing particles in gas insulation systems. The authors observed the movement of conducting prolate spheroidal particles under uniform electric field in air. From the experimental results we found three patterns of the movement. The critical electric field results in particle rotating or lifting. The particles rotated about the contact point before lifting in most cases. The measured particle-rotating field was lower than the analytical ones by 6 and 21% for 9 and 18 mm gaps, respectively. From the experiment, the size of the particles and the gap distance affect the critical field. The voltage polarity has no effect on the critical field for particle movement because of little difference between the experimental values of positive and negative polarities.