Abstract: The reaction performance of supercritical Fischer-Tropsch synthesis in a fixed bed reactor was studied in this work. n-hexane was used as supercritical media. Three kinds of Co catalysts: impregnated catalyst, sprayed catalyst and bimodal catalyst were tested. Under the same Co content condition, the catalytic activity of the sprayed catalyst was similar with that of the bimodal catalyst, but higher than that of the impregnated catalyst. CO conversion over the sprayed catalysts was remarkably higher than that over the impregnated catalysts. Higher lighter fractions selectivity and lower 1-olefins content of FT products were observed over the sprayed catalysts. At the similar CO conversion conditions, however, the 1-olefins content over the sprayed catalyst was similar with that over the impregnated catalyst. For impregnated catalyst, CO conversion increased obviously from 8.3% to 43.6% when Co content increased from 5% to 15%. CH 4 selectivity for 5% Co catalyst was lower about 2.0%~3.0% than those of 10%, 15% and 20% Co catalysts. 1-Olefin content of products over 5% Co catalyst was obviously higher than those over 10%, 15% and 20% Co catalysts.