The ultrafine particles of a new style Fe-Cu-based catalysts for CO hydrogenation were prepared by impregnating the organic sol of Fe(OH)_3 and Cu(OH)_2 onto the activated Al_2O_3,in which the organic sol of Fe(OH)3 and Cu(OH)_2 were pre- pared in the microemulsion of dodecylbenzenesulfonic acid sodium(S)/n-butanol(A)/toluene(O)/water with V(A)/V(O)=0.25 and W(A)/W(S)=1.50.This catalyst was characterized by particle size analysis,XRD and TG.The results of particle size analysis showed that Fe(OH)_3 particles with a mean size of 17.1 nm and Cu(OH)_2 particles with an average size of 6.65μm were obtained.TG analysis and XRD patterns suggested that 673 K is the optimal calcination temperature.CO hydrogenation produced C_2~+OH with a high selectivity above 58 wt% by using the ultrafine particles as catalyst,and the total alcohol yield of 0.250 g·ml~(-1)·h~(-1)was obtained when the contents of Al_2O_3 and K were 88.61 wt% and 1.60 wt%,respectively. The ultrafine particles of a new style of Fe-Cu-based catalysts for CO hydrogenation were prepared by impregnating the organic sol of Fe (OH) _3 and Cu (OH) _2 onto the activated Al_2O_3, in which the organic sol of Fe (OH) 3 and Cu (OH) _2 were pre-pared in the microemulsion of dodecylbenzenesulfonic acid sodium (S) / n-butanol (A) / toluene / water with V (A) / V A) / W (S) = 1.50.This catalyst was characterized by particle size analysis, XRD and TG. The results of particle size analysis showed that Fe (OH) _3 particles with a mean size of 17.1 nm and Cu (OH) particles with an average size of 6.65 μm were obtained. TGA analysis and XRD patterns suggested that 673 K is the optimal calcination temperature. CO hydrogenation produced C_2 ~ + OH with a high selectivity above 58 wt% by using the ultrafine particles as catalyst, and the total alcohol yield of 0.250 g · ml -1 (h -1) was obtained when the contents of Al 2 O 3 and K were 88.61% by weight and 1.60% by weight, respectively.