Abstract: Pipeline is the tool for transmiting material so that the electrical signal would be attenuated in a fast way along the pipeline. It is normal that the transmiting constant has more than thousand times than the communication line itself. Thus, we call it as the highly attenuating conductor for electrical signal transmission. To probe the electrical signal transmiting regularity of pipeline and the development of its communication capability, this paper makes researchs on the capability of pipeline responding to signal, the transmiting distance, the characteristics of frequency band, the pattern distortion, the transmission pattern, the activation system of higher pattern, the identification system of higher pattern and the analysing and controlling system. Thus, a set of communication system combined with multi-signal-chip units has been established and the remote indication for the potential of pipeline cathodic protection has been realized.