Abstract: In order to study the ash behavior features of coal in Pingshuo Mining Area and to provide the basis to the pollution control of the trace elements, a refle cted-light microscope, scanning electron microscope and other means were applied to study the distribution and deposition features of the clay mineral, aluminium hydr oxide mineral, calcite, siderite, pyrite and other minerals in No.4 coal seam of Pingshuo Mining Area.The paper also had a deep analysis on the distribution features of t he dispersed minerals and trace elements in the clay mineral in coal of Pingshuo Mining Area as well as the paragenetic and metasomatism function between each min eral.The study showed that the clay mineral in coal of Pingshuo Mining Area mainly would have two different optical properties.The Si/Al atomic ratio in two clay mineral s was close and there was a small difference in the mineral composition. The kaolinite was the mineral mainly in the composition of the clay.The aluminium hydroxide mi neral was the typical mineral type in Permian coal of Pingshuo Mining Area.In comparison with coal in other areas, AI2O3 was the important sources in the ash and had a close paragenetic with calcite, pyrite and other minerals.