1. The potential changes of galvanic skin reflex usually consist of negative (hand becomes more negative) and positive deflections.2. With intense or successive stimulation, the amplitude of negative deflection increased at first and then positive deflection grew step by step in size. Finally the negative deflection was invisible.3. Lying on one side inhibited not only the positive but also negative de flection in the same side.4. Local ischemia abolished the positive deflection.5. Local cooling and warming gave inhibitory and facilitatory effects on GSR respectively.6. From these results it is concluded that GSR is composed of two basic elements, i.e. negative and positive processes. The characters of these processes are discussed.