A commissioning method, a master control board, and a service board are provided. The method comprises: a master control board switching a transmission channel to a commissioning serial port and transmitting a commissioning enabling signal to a selected service board; and after the service board receives the commissioning enabling signal, the service board switching the transmission channel to a local commissioning serial port and performing commissioning processing with the master control board. The embodiments of the invention preserve the commissioning serial ports inside single boards (i.e., service boards) for commissioning single boards respectively as well as enable the serial ports of the master control board of a core switch system to perform serial communication conveniently with CPU of any single board of the core switch system.