The invention relates to a method for generating a forwarding table, which comprises the following steps: using data packet flooding as basis, and backward generating the forwarding table; according to congestion degree of a backward port, adjusting waiting delay of a flooding packet in a node, so as to further achieve flow balance, and reduce change of forwarding table items; and through flooding a change event of network topology or shortening a flooding period of a guiding packet, reducing convergence time of the forwarding table. In brief, the method has the characteristics of simple realization, quick convergence and balanced flow.