Transcranial direct current stimulation ( tDCS) is a noninvasive brain stimulation method. tDCS treatment is applied by transmitting direct current betwen anode and cathode electrodes that are located over the head. Due to tDCS treatment is cheap and noninvasive method,a growing amount of research have been carried out on it’s effectiveness and application areas in the last decade. It has started to be applied at the neuropsychiatric diseases beside motor cortex stimulation. In this rewiew, the purpose is to discuss application metods, application areas and probable mechanism of action.