With the developement of science and technology, steel corrosion data onsubmarine sediment is urgently needed for submarine engineering design. The author, for the purpose of not disturbing sediment, invented a methed called “corroded electrochemical measurement of marine deposit (MD)”.This paper disccusses the corrosion process and variation rule of three kinds of steel with the MD mothed based on the measured of corrosion voltage and polarization resistance.