In view of intelligent substation network redundancy issues， the parallel redundancy protocol（PRP） in IEC 62439-3 is mainly analyzed and network topology and recovery time based on PRP are deeply studied. The principle of double attached node implementing PRP（DANP） structure and redundancy implementation are expounded. Furthermore， the adopted discarded redundant algorithms and redundant software architecture are analyzed. In order to achieve better redundancy， redundant network supervisory and management programs are adopted so that， in intelligent substation network based on PRP， network security and real-time capability can be well protected.