A light bulb used in a light string comprising a lamp holder snapped onto the first wire and the second wire. A wiring base and a lamp shade are mounted on the lamp holder. A connection part is provided on the lamp shade, and the connection part is embedded between the lamp holder and the wiring base. The first wiring terminal for connecting the first wire and the second wiring terminal for connecting the second wire are embedded on the wiring base. The top of the first wiring terminal is connected to the first wire, and the top of the second wiring terminal is connected to the second wire. The bottom end of the first wiring terminal and the bottom end of the second wiring terminal are connected to each other by a filament.