Based on setting up the classification of the network usable resources and its locking time

a kind of simple distributed dynamic optical link establishment method with CoS （class of service） in automatic switching optical network was proposed. By this method

three kinds of optical link establishment with CoS can be realized. The proceeding scheme of the network node was also presented. Through simulation and experiment in a star wavelength router network

the method is verified and is useful for the optical link establishment in automatic switching optical network.