The behavior of solution droplets placed on the surface of the polycarbonate plate under dc field was investigated experimentally. In order to investigate the effects of the content of flame retardant on the energy of discharges occurring between the two electrodes, the content of the flame retardant of polycarbonate plate varied at 15%, 10%, 5% and 0%. The solution droplet was placed on the polycarbonate plate in contact with the needle (copper wire) electrode. It was proven that the contact angle between the sample surface and solution droplet decreased with increasing the content of flame retardant. On the sample surface, the droplet is easier to be extended to the opposite side electrode with applied negative bias voltage than with applied positive bias voltage. The extension distance of the droplet change to be short, as the content of flame retardant was increased. The time start to discharge was shorter with applied positive voltage than with applied negative voltage. As the content of flame retardant was increased, the time to discharge was decreased. The discharge energy on the sample surface was increased, with increasing the content of flame retardant.