In this paper, a novel multi-wavelength star optical network reusing all channel wavelengths three times is proposed by the method of “（Distributed Architecture) + (Return Link) + (Wavelength Group)”. In this scheme, by interconnecting four conventional star couplers and reusing all channel wavelengths three times, both the maximum number of supportable nodes and the maximum throughput of the network are all up to four times as many as that of conventional WDM star network. Utilizing bidirectional transmissions in a single fiber, half fibers can be saved under the same number of supportable nodes. Making use of the distributed architecture, the anti-destructibility of network is drastically raised. All these advantages of the network efficiently overcome the disadvantages of conventional WDM star network.