We synthesized platinum nanoparticles supported on various types of carbon (ketjen black, oxidized ketjen black, Vulcan XC-72, oxidized Vulcan XC-72, reduced graphene oxide, graphene oxide) by ultrasound-assisted polyol synthesis method and studied the effect of oxygen functionalization one the population of Pt NPs. To prepare Pt/X (X = KB, KB-oxi, VC, VC-oxi, RGO and GO) samples, Pt(acac)2 and one of carbon support were dispersed in ethylene glycol and irradiated by ultrasound for 3h. Based on the structural characterization data, we found Pt/KB-oxi, VC-oxi and GO samples have plenty of population though transmission electron microscope (TEM) on each support respectively. Degree of oxidation of samples was investigated by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Compared with the relatively reduced form of support, KB-oxi, VC-oxi and GO have big weight loss and exothermic curve. It means that they were successfully more oxidized than KB, VC and RGO. In conclusion, we verified that the effect of oxygen functionalization on carbon support can increase the population of Pt NPs.