Along with the increase of demand of radio communication and with the rapid progress of communication systems, the radio frequency interference of neighbor nations is a matter of argue. This problem is a delicate matter which must be dealt with technical background. The radio interference has been experienced in the Korean TRS service on the south seashore due to the seashore base station in Japan. The radio interference problem between neighbor nations has become the matter of conflict. For the purpose to solve this problem, we has measured the radio waves that come from Japan mainly to Korea and also analyzed the radio interference.