Abstract: A full bridge oscillation resonance high power factor invertor being connected between a power source and a Load has a first inductor and a second inductor. The first and second inductors are respectively connected to a full bridge inverting circuit. The full bridge inverting circuit is connected parallelly to an energy storing capacitor. The present invention integrals conventional multiple stages invertor/convertors as a signal stage which is low cost and provides a very high transforming efficiency. The two inductors share current Loaded of the invertor, the invertor is able to provide a high power transforming performance. Switches of the full bridge inverting circuit all switch under zero voltage to reduce switching loss of the full bridge inverting circuit.