This invention relates to a signaling process method for a distributed WDFD optical path exchange system, in which, each node is distributed with a set of fixed signaling receiving wavelengths, which are not repeated for different nodes, and the signaling information going to different nodes are modulated to the signaling receiving wavelength of said node in low frequency to token the target address and said low frequency modulation information carries the source address, different wavelength selectors are used to realize reception of signaling information, lock of the receiving wavelength channels and reception of signals.