The embodiment of the invention provides a communication port stability control method and device. The interfered frequency band to be adjusted on a target line under a communication port is obtained;at least partial data currently born on the interfered frequency band is allocated to be born by at least one target frequency band in other frequency bands on the target line; thereby, the problemsof poor communication port stability and low user satisfaction due to the fact that the interfered frequency band overlaid with other lines exists on a G.FAST line in the existing communication can besolved; and, by means of the method, the communication port stability and the user satisfaction are improved.