Chaohu Stone is a general term for the formation of carbonate rocks by a variety of geological modeling stone. From the exterior, the Taihu very similar, but in addition it has the shape of Kit Kat Taihu and "thin, wrinkled, through leakage" and other similarities, but also has the following five characteristics. First, the stone round holes, holes as much as the circular aperture, the hole wall of light, called a must, not only for the medium-sized stone Chaohu, Chaohu and miniature pocket hole ripped through the stone will also appear on the stone body. Secondly, the tendons inside the stone often composed of calcite (pulse) aspect interludes, and quantity, widely distributed. Since calcite stone often interspersed in the formation of Chaohu similar letters, Arabic numerals and characters pattern, is a modeling and texture stone stone stone composite double. Third, the stone is not only rich polymorphism, changes treacherous, but also the size of the disparity in shape and weighs 100 tons more than those who have, more than 20 tons of stone is everywhere, and weighs about 250 grams, containing fossils possessed Chaohu stone rounded cavities are plenty of pocket, into account as early as the Ming Dynasty, "Yuan Ye," a book there are records. Fourth, the stone often long Chaohu birth siliceous or calcareous mud ingredients "tumor", it can spread prominent stone body, can also be combined into a cluster chain, can play a finishing touch. Fifth, Chaohu stone often accompanied by marine invertebrates fossils, fossil itself is a beautiful ornamental, Chaohu exquisitely carved stone blend with each other, become a highly favored people double ornamental stones.