It is estimated that the collecting characteristics of particles for an electrostatic precipitator (EP) is influenced by the ionic wind (IW) which caused by the corona discharge. In order to study this influences, IW velocity at the model EP which has the corona discharging field was measured by a Thermistor-anemometer. The characteristics of the maximum of IW velocity and the modes of IW velocity distribution were obtained through these measurements. In this measurement two types of EP were used