A method for obtaining crosstalk information includes the following steps: obtaining the transmission power variation of the crosstalk source and the noise power of the crosstalk destination; based on the obtained transmission power variation of the crosstalk source and the noise power of the crosstalk destination, obtaining the crosstalk coefficient of the frequency point in which the dynamic characteristic varies, as the crosstalk information. A device for obtaining crosstalk information comprises a crosstalk coefficient obtaining module for obtaining the crosstalk coefficient of the frequency point in which the dynamic characteristic varies. Based on the crosstalk coefficient in the lines, it is ensured that the crosstalk coefficient obtained is close to the real crosstalk information.