Abstract: Underground coal dust is harm to miner while it has a great security risk, dust suppression have great significance. The author aims to study polymer Surfactants as the main agent of foam dust suppression agentto to reduce the concentration and damage of coal dust. This experiment was the graft copolymerization of corn starch and Octadecanol, in order to synthesize surfactant, by orthogonal test to determine optimal feed ratio is 1:1.5 of oxidized starch and Octadecanol, the temperature is 70 ℃, the heating time is 8h, the solvent is 55ml. The wetting and wetting rate of this surfactant compared with sodium lauryl sulfate and myristyl trimethyl ammonium bromide were preferred. The surfactant as the main agent,through experimental study screened surfactant/foaming agent/flocculant system the optimal formula for the dust suppressant, detecting its wettability, cohesion and water retention on coal dust, detemined the optimal ratio of surfactant, polyacrylamide and sec-octyl alcohols was 7:1:2. The foam dust suppression agent preparation process is simple, the price of raw material is low, can very good wetting dust, improve the efficiency of dust suppression.