The effects of silane KH570 and stearic acid on ceramic injection molding for different stages were studied and analyzed in this article. Results show that stearic acid can play an effective part in reducing viscosity of as-received Si3N4 powder system and silane KH570 can play an important part in oxidized Si3N4 powder system. Debinding value was not affected by surfactants and its dosages, but the density and hardness of sintering body were reduced with the increasing of surfactants content. Density and hardness of sintering body could be improved when solvent debinding process was applied.