Field-effect transistors (FETs) based on SiC nanowires (SiC NWFETs) are believed as the most promising nanodevices worked in high temperature and high power. In this paper, dielectrophoresis was used to align SiC nanowires. Moreover, SiC NWFETs based on an aligned single nanowire were obtained. The electrical properties of the SiC NWFETs were investigated with Agilent semiconductor parameter analyzer. The result of the measurement shows that the contact between Au electrodes and SIC nanowires is nearly ohmic contact.