Abstract: Sepiolite of economical value has been found at Quanjiao county, Anhui province and at some other places in China.we made a series of experiments to study its mud-making capacity, rheological properties and various factors affecting the properties of the mud made from it, then, we practically applied the mud in fields.The sepiolite can build up viscosity in all kinds of water, increasing its yield point without increase of plastic viscosity, and the mud yield is as high as 80 M~3/T.