Abstract: Ion cyclotron range of frequency (ICRF) heating is used in EAST Tokamak as one of the most significant auxiliary heating tools, and it shows a good performance. The antenna should be matched to radio frequency generator to ensure maximum power of heating. In the experiment of ICRF heating, variable plasma parameters will induce to fast vary loading impedance of antenna. The fast impedance matching system being fit for this situation was developed. By using analysis method and computer simulation, the ferrite tuner was developed and tested as the most important part of matching system. The test results show that good time response of the tuner is much faster than that of traditional method, and this can make it to be the candidate for real-time matching.