Deposition of two-dimensional(2D) MoS_2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave mixing.Ethanol catalytic deposition(ECD) of MoS_2 on the optical tapered fiber was proposed and demonstrated in this work.Different from the conventional optical driven deposition using water or organic solvent,the ECD method utilized the high volatility of the ethanol solvent,which significantly increased the movement speed of the MoS_2 nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the deposition.We believe the ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides.