In all of isolated power converters, flyback converters are widely used for low power electrical appliances because of its simple circuit topology, low cost and fewer components. But in traditional structure, for acquiring the stable output secondary-side control IC sinks big current through photocoupler when no loads. However, standby power loss shall be the lowest intuitively. Therefore, reverse phase 180 degrees of the feedback topology in the system for reducing this current. To achieve cutting down the standby power consuming efficiently and it keeps the function, constant voltage and constant current control, original secondary-side control IC had. Through taking parameters of the common IC on the market for reference, adjust the parameters in new system by calculating about the same. Finally, prove that the way proposed efficiently reduces the standby power loss by simulation.