Abstract: Coal powder and sand are both used as two kinds of aggregates， and both gypsum and cement are used as cementing agent in the similar material preparation of raw coal. Through the single factor analysis， the influence on the strength of similar material under different composition proportions of coal powder， gypsum， cement and sand was studied during the experiments. The results indicated that the similar material of coal powder as aggregate shows a negative linear correlation between the strength and coal powder consumption dosage， meanwhile， the properties of similar material is easy to be controlled. While the similar material that uses sand as the aggregate shows a non-linear relationship， and the properties of similar material is difficult to be controlled. Therefore， the coal powder is more suitable than sand as the aggregate of similar material of raw coal.The results provide good references for similar material design of raw coal.

Key words: raw coal, similar material, aggregate, coal powder, composition proportion