A station-to-station synchronous and interleaved phase system for multiple DC or AC power supplies connected in parallel includes a master and a plurality of slaves. The master and the slaves each includes a time base selector, a time base generator, a station-to-station synchronization and interleaved phase controller, a local interleaved phase controller and multiple sets of switching circuits, so that the switching circuits are controlled by the local interleaved phase controller to form interleaved phases, and the time base selector and the station-to-station synchronization and interleaved phase controller further control the station-to-station phases between the master and the slaves, and further generate synchronization and interleaved phases between the master and the slaves. In addition to the advantages of increasing the equivalent operating frequency, it can reduce the rate of ripples and increase the response speed.