Abstract: As the main energy source in our country, coal plays an important role in the development of the national economy. In order to facilitate industrial operation, it is necessary to reduce the temperature of coal with high ash melting point. The cement with a lower melting point was selected, and three high-melting coals (Datong, Zhundong, and Changping) were added according to a certain ratio to explore the effect of the cement on the ash melting characteristics of the high-ash-melting coal. The results show that the mortar can reduce the ash melting point of the three high-melting coals, but the degree of reduction in the melting temperature of the three coal ash is not linearly related to the content of the mortar. The effect of mortar on reducing the melting temperature of three kinds of coal ash is presented: Datong> Zhundong> Changping; the lower ash melting point of mortar is mainly due to the high content of alkaline oxides in the mortar and low content of acidic oxides, which are easy to combine with oxygen. On the contrary, alkali The ion potential of the sex ions is low, which reduces the aggregation of polymers, thereby lowering the ash melting point.