The invention discloses a topology control method construction of k-point communication under two-channel communication. The problem that when a primary user occupies an arbitrary channel, some secondary users lose communication ability, resulting in network separation and interference among the secondary users in the prior art is mainly solved. The implementation process is as follows: 1, broadcasting an HELLO packet for twice by each node in a network, and establishing a local two-hop topological sub-graph (the formula is as shown in the specification); 2, establishing a local k-1 point communication topological sub-graph Gu based on (the formula is as shown in the specification); 3, constructing a local generation sub-graph S ensuring the k-point communication under two-channel communication of the user according to Gu; 4, adjusting the transmitting power according to a one-hop neighbor node in S; and 5, forming whole network topology by links among all nodes and logic neighbor nodes of all nodes in the network, and performing channel allocation. By adoption of the topology control method, the k-point communication of the network is ensured while the two-channel communication of the network of the user is ensured, the interference among the secondary users is eliminated, the robustness of the network is improved, and the topology control method can be used in a cognitive Ad Hoc network.