The technical issue of direct ethanol fuel cells is slow kinetics and low CO2 selectivity of ethanol electrooxidation by using Pt. Silica embedded carbon nanofiber (SECNF) was prepared as a catalyst support to improve electrocatalytic characteristics. Catalysts were characterized by SEM and XRD. Electrochemical measurements were performed to analyze catalytic activity and electrochemical active surface area of Pt/SECNF. The mass activity of Pt/SECNF was twice as high that of Pt/carbon nanofiber. In contrast, the value of ECSA was almost constant for each nanofiber catalyst. However, too much SiO2 addition was not preferable in the viewpoint of specific resistance of the sample layer. The activity enhancement is attributed to the improvement of specific activity for Pt/SECNF by the interaction between Pt and SiO2.