It is very necessary to investigate the corrosiveness of ocean engineering geology and seabottom sediments, to measure the PH, Eh, ρ and corrosion electrochemical parameters of sediments. Previous measurements methods were all conducted in a test container by filing it with seabottom mud taken from a geology sampling device. The structure of the original seabottom mud was destroyed by this method as the mud was exposed in the air for sometime, and so was affected and polluted by air factors and accuracy and repeatability of the results were comparatively poor. In this in-situ method for measureing sediment corrosion factors, the measurement was conducted directly via a sensor in a corrosion factor measurement tube, containing seabottom mud from an ocean engineering geology sampling device. The shortcommings of the previous damaging methods were overcome and the new method was very valuable in practical applications.