To settle the ever profound protection device and its limited human-machine interface, this paper promotes and implements a communication and debugging system extended from the IEC60870-5-103 protocol. The system extends IEC60870-5-103 protocol by supporting device menu reading, access control, device command execution and other functions besides its pre-existing functionality, which makes up the protocol’s limitations such as weaker human-machine interface of device panel, lacking of menu structure and access control, and incomplete supporting of all interface functions, etc. Engineering application in protection devices demonstrates the system has high communication stability and comprehensive debugging functions, as well as supports all interface functions of the device, thus effectively increases the development and debugging efficiency for protection device.