According to development situation of electronic transformer， the key technical difficulties of digital synchronization and digital communication in the electronic transformer are given emphasis to study and settle. At the aspect of digital synchronization， the digital signal waveform is forwarded in a large range and maintains approximately linear-phase delay with digital phase-shift and phase equalization technology. The two-order interpolation is used to adjust the phase precisely in a small range. In the digital communication， in order to solve the shortage of interactivity in IEC 61850-9-2 LE， the idea of distributed sampling value control block（SVCB） is proposed and also the communication protocol among the distributed SVCBs is fulfilled. The analysis shows that the method proposed is feasible.