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In the struggle for discourse power, different communities propagate different political values to their people, and some communities additionally adopt Internet censorship to block values that differ from their own. In blockaded communities, some people manage to bypass the blockade. Some of these people are no longer influenced by the propaganda of their communities and become independent, while others remain affected by it and are unswerving. On this basis, we propose an opinion dynamics model of two opposite groups with bilateral propaganda and a unilateral information blockade, and divide the population into four categories: the independent bypassing agents, the unswerving bypassing agents, the remaining agents in the blockaded group, and the agents in the blockade-free group. In the model, the opinion evolution follows the Deffuant–Weisbuch expression. The bilateral propaganda works in …