Abstract: In order to provide a basis for improving the beneficiation indicators of Yanshan Iron Mine，the process mineralogy studies are carried out to identify material composition，structures，occurrence features of major minerals，dissemination size and dissociation performance of iron ore. According to the process mineralogy findings，it is indicated that improving the beneficiation index needs to optimize the ore blending and grinding process for the eastern and western ores in Yanshan Iron Mine.

Key words: Yanshan iron mine, Mineral composition, Structure, Embedded features of minerals, Particle property of iron minerals