Although IEC 61850 has put forward very high request on time synchronization of sampled values， the implementation scheme has not been provided. Referring to the shortages of existing sampled values synchronization scheme， an interactive sampled values transmission mechanism based on IEC 61588 and generic object oriented substation event（GOOSE） protocols is presented. The intelligent electronic device（IED） in bay layer adopts IEC 61588 precision time protocol to synchronize the corresponding slave clock of the sampled values control block of the merging unit concerned. And sampling control is completed on sampling value control block through GOOSE protocol. This mechanism can achieve high precision synchronization without depending on external time synchronization signal.