The invention provides a method for settling internal coexisting interferences of a terminal, a system and a mobile terminal thereof. The method of the invention comprises the steps of: detecting a working frequency band of an internal communication module of the terminal; and performing bandpass filtering according to the detected working frequency band and at least one preset band-pass filter. The method of the invention can settle the coexisting interferences between a WLAN and an LTE in the terminal and simultaneously prevents frequency spectrum resource wastage as possible.