An adaptive power adjustment method and means based on reducing crosstalk among DSL lines includes: calculating the crosstalk power spectrum density and the crosstalk function from the neighboring line in current line; calculating the transmission power spectrum density of the current terminal device according to the obtained crosstalk power spectrum density and crosstalk function; and the current terminal device controlling the transmission power based on the transmission power spectrum density. According to the adaptive power adjustment method of the present invention, the transmission power can be increased or decreased. The disadvantageous effect due to the crosstalk among xDSL lines is reduced. Present invention can eliminate or reduce adequately the strong impact on remote terminal application scene, and make the lines achieve the optimum operation state.