Abstract: One improvement of the structure of decorating light string's light bulb. The light bulb has two opposite copper filaments inside. These two copper filaments are linked together at their middle segment, and then fixed at a proper place on the socket of the light bulb. Their bottom segments stretch outside of the bottom, and their upper segments are being withheld inside, of the bulb. On the copper filaments withheld inside of the bulb, multiple places are linked together by tungsten filaments. After the electrical power is supplied, several light spots can be generated.