Embodiments relate to a method for fabricating a transistor by using a SOI wafer. A gate insulation layer and a first gate conductive layer on a silicon-on-insulator substrate of a substrate to form a first gate conductive pattern, a gate insulation layer pattern, and a silicon layer pattern. A device isolation insulation layer exposing the top surface of the first gate conductive layer pattern may be formed. A second gate conductive layer may be formed. A mask pattern may be formed. Then, a gate may be formed by etching. After forming a source and drain conductive layer on the silicon layer pattern, the mask pattern may be removed. A salicide layer may be selectively contacting the gate and the source and drain conductive layer may be formed.