The typical modes of intelligent distributed feeder automation can be divided into substation level distributed mode， feeder level distributed mode and breaker level distributed mode（including load switch mode and breaker mode）. Their system realization principles， configurations and function features， such as system independence， topological adaptability， maintainability， compatibility， and speed of action， are summarized and compared. On this basis， the system extending model of IEC 61850 and system configuration process are proposed from the viewpoint of intelligent distributed feeder automation technology realization. And the extended model based algorithm for intelligent distributed feeder automation is studied.