Suppressing dissent is unfair and violates the principle of freedom of expression. It will destroy a healthy and open communication environment, so it should not be implemented. However, understanding these undesirable methods from a negative perspective will help us better maintain the fairness and freedom of speech space. There are the following.： Technical means： -Restrict the distribution channels of speech: through algorithms, keyword blocking, etc., certain speech containing objections are directly prohibited from being published. -Current restriction and rights reduction: reduce recommendations and exposure to accounts or content that express dissenting opinions, making it difficult to be seen. -Data monitoring and blocking: Use big data to monitor user speech, and block accounts or IP addresses after discovering dissenting speech. Social strategy： -Create public opinion pressure: organize some supporters to besiege and abuse dissidents, forming an atmosphere of public opinion so that dissidents dare not speak out. -Group exclusion: Guide the formation of an atmosphere of rejection of dissent within the group, isolate those who raise objections, and marginalize them in the group. -Information manipulation: selectively publish one-sided information or false information, distort dissenting views, mislead public perception, and make it difficult for dissenting opinions to gain support. We should resolutely oppose and resist any behavior that suppresses reasonable dissent and destroys freedom of expression, and advocate a rational, inclusive, and equal exchange environment.