Late Permian Wujiaping banding siliceous rock is widely distributed in the upper Yangtze area. Small foraminifera, ostracoda, brachiopod and dissoconch are common but radiolaria is Lack of and calthrop is rare. The observation of microscopic sections has shown that pioclasts are most silicated and residual calcites can be found. Average ratio of MnO/TiO2 is 4.5. There are 4 specimens that fall in domainⅠin the Al-Fe-Mn discrimination diagram. The ratios of Co/Ni are less than 0.5 with the average of 0.127. Total volume of the rare-earth element is 1.4778×10-6. The values of∑LREE/∑HREE are less than 1. The HREE has a concentration tendency. All of these characteristics indicate that the Si in the silica rock derives from the hydrothermal deposits. It is believed that the silica rock isa deposition-alternation product, which was caused by metasomatosis of limestone. The silica rock is commonly built up in the deepwater slope and partly in the open platform so that it formed in the same depositional environment with carbonate rock.