Abstract: The orthogonal experimental method is applied to conduct the multi-factor,multi-level and multi-objective experiments based on the preferred dust suppressive factors.The orthogonal experimental results is researched by adopting the intuitive and variance methods,besides that,the influence of dosage of each component of composite dust suppressant on each index is obtained.The optimal formula of each index show that,pH value is 8.38,viscosity value is 144.6 mPas,moisture content of the dust samples is 25.68％ after evaporating for 8 hours and the proportion of oversize product is 71.44%.In the end,the optimal formula of A2B3C2D1 is acquired by using the comprehensive balance method.

Key words: Haulage roadway, Composite dust suppressant, Design of mix proportion, Orthogonal experiment