Abstract: With the continuous development and upgrading of high-value conversion technologies for coal resources,gasification slag has a huge annual output and causes serious pollution to the environment as an important solid waste produced in China in recent years. In view of the resource characteristics of gasification slag,it is currently mainly used to prepare low-end building materials and high-end ceramics and other aluminum-silicon composite materials. However,the market for construction and building materials utilization has become increasingly saturated with the improvement of Chinese infrastructure construction,so the high-value conversion and utilization of slag has become a current main research hotspot. However,due to the lack of knowledge about the stability and occurrence of the element/material composition of the gasification slag,the preparation of most composite materials is currently in the laboratory research stage,which is not enough to realize industrial production. In response to the above problems,gasification slag from four different regions was selected as the raw material for this article,and the element composition,material composition,micro morphology and element occurrence forms of fine slag/coarse slag in different regions were studied. It can be seen that the gasification slag is mainly composed of aluminosilicate glass (≈40%) and amorphous carbon particles (5%-50%). The total content of aluminum and silicon is about 40%,and the content of iron and calcium is 20%-40%; Most of the calcium and iron form a eutectic with it,and only a small amount of calcium and iron exist alone.The main difference between the fine slag and the coarse slag is that the content of carbon in coarse slag (5%-20%) is lower than that in fine slag (20%-50%),the carbon content of fine slag is higher,and the glass phase reactivity is higher than that of the fine slag.