The invention provides a power distribution method of a direct current power distribution system of an intelligent building. The direct current power distribution system comprises a power distributioncurrent transformer, a direct current bus, a distributed energy source, an energy storage unit, a load and a port current transformer. The power distribution current transformer transforms alternating current into direct current and then the direct current is connected to the direct current bus. The distributed energy source, the energy storage unit and the load are connected to the direct current bus through the port current transformer. The method comprises steps of fusion of virtual motor control in the port current transformer and autonomous control of the port current transformer. According to the invention, by adopting the virtual synchronous motor control strategy, the virtual direct current motor control strategy is adopted in the direct current port current transformer, so the transformers are perfectly unified in control; through the inertia and damping performance of the virtual motor, the ability for coping with the disturbance of the direct current power distribution system is improved; and through the outer characteristics of the virtual motor, each current transformer is allowed to share power according to the rated capacity in the bus voltage fluctuation process ofthe direct current power distribution system, so the stability ability of the direct current voltage is improved.