Abstract: A new type of coal dust suppressant was developed by modifying soybean protein isolated with sodium dodecyl sulfate, carboxyl methyl cellulose and methyl sodium silicate.To show a wide applicability and advancement, the test was carried out on the Shenzhou mixed coal, bituminous coal and anthracite comparing with two other similar commercial products.The results show that a hard layer of solidified layer is formed on the coal surface after the spraying of suppressant.This layer has a certain strength and resistance against strong wind and heavy rain, resulting in a better performance than that of the commercial products.Furthermore, soybean protein isolate is a natural material which is more environmental sustainable.