An improved share circuit for normal electrical power which is used in a normal electrical power system of a power supply of a computer. The normal electrical power system has a direct current output circuit to provide initial power for starting the computer and the direct current output circuit has a share circuit including a switch line which can be selected to a state of supplying power and a normal circuit for power output for maintaining the computer to start at a normal condition. The switch line is electrically coupling to a load having an external switch and users can control the external switch to a close-circuit state when the computer is at a shut down condition, so as to generate electricity to drive the load, when the external switch is at an open-circuit state. The direct current output circuit will cease electricity output and stop actuating the load.