This article is based on the experimental research on the experimental bench of dual electrodes charge system's discharge characteristics which simulates flue gas to air. The results show: 1 The electric quantity negative corona discharge is more than that of positive for different particles on the same voltage conditions. 2 An anti-wind device installed on the electrode plates could prevent the charged dead zone and keep good discharged performances of barbed wires. 3 It takes short time to make the electrode plates breakdown and decreases the breakdown voltage while the experiment is done on the condition of high relative humidity. 4 The optimum plate spacing of dual electrodes charged device is the spacing of electrode positive discharge to electrode negative = 110 mm, and the spacing of electrode negative discharge to electrode positive = 90 mm.