Most of the boreholes in the Xiling exploration area are located at the seaside. During drilling， seawater or seawater intruded water is used for slurry making. The traditional fresh water mud system doesn’t perform well or even fail in carrying cuttings， lubricating drilling tools and protecting hole walls， which affects smooth drilling progress. The traditional mud materials were innovated with introduction of new seawater salt resistant mud materials to develop the seawater drilling fluid composition with better performance for the mining area； thus eliminating safety hazards and improving drilling efficiency.