A preliminary investigation was conducted to clarify fundamental characteristics of a micro fan utilizing ionic wind induced in the pin-to-plate gas discharge field. The fan was consisted of a pin electrode, a plate electrode with a hole and a heated plate under the plate electrode. When high voltage was applied between the electrodes, ionic wind flowed through the hole of the plate electrode toward the heated plate. This paper was focused on optimization of the electrode configuration and the enhancement of cooling effect by experiment and calculation. A numerical calculation was conducted by two steps. The corona discharge field was calculated with the finite element method and ionic wind induced by the migration of ions was calculated with the finite differential method. The experimental investigation deduced that : (1) The flow rate was increased with the increase of the hole diameter and the static pressure was increased with the increase of the plate thickness. (2) A gap-to-hole diameter ratio of 0.8 to 1.1 was found to be an optimal value that gives the highest power and efficiency. (3) The enhancement of the heat transfer coefficients was increased with the increase of the distance between the plate electrode and the heated plate. These experimental results were in good agreement with the calculated results.