With the development of IEC 61850 digital substation standard， a digital integrated protection scheme based on PowerPC， DSP and BLVDS is proposed. Platform made of PowerPC with VxWorks is used to complete digital sampling and sending GOOSE packet. DSP protection module is used to accomplish functions of measuring and control， and protection algorithm as well. Data stream between the above two CPUs are exchanged through high speed BLVDS bus. This paper mainly emphasis on system scheme， hardware and software platform in process level and implementation of digital sampling. System test proves that platform based on PowerPC， DSP and BLVDS can definitely satisfy requirements of digital integrated protection.