Usually cockroaches move from light to dark. We attempted to change the direction of movement of a male cockroach, Periplaneta orientalis, from dark to light areas by punishment method. A glass box put on a copper plate was used, through which current could be passed. When electric current was passed, the cockroach ran around and tried to crawl up the glass walls. This procedure was repeated a number of times, according to individual differences, when the cockroach moved from light to dark. Results show that on attaining the boundary line between dark and light, the cockroach suddenly stopped, moved its head in all directions and began rapidly moving its antennae. After this, it turned back to the light, thus overcoming the first stage of phototropism by training. After gaining this experience, an animal coming from the light to the boundary line, remained still, with its head pointed toward darkness, and when prodded, struggled against going into the darkness.