An orthogonal experiment was conducted in laboratory to investigate the Shenhua coal water slurrying property.The regression equation was obtained by multi-factor regression and variance analysis

and the optimal additives ratio and particle size distribution were gained through a computer program optimization method.The results show that the optimization method can raise solid concentration of the Shenhua coal water slurry

and the concentration is increased from 59.51% to 62.36%.Furthermore

the stability and rheology of the coal water slurry are also improved after particle size gradation.