[Purpose/significance] Exploring the formation mechanism of cognitive illusions induced by AI algorithms in the "time-sink" phenomenon and clarifying its impact on intelligence perception and public opinion communication is of great significance for the governance of the information ecosystem in the digital era. [Method/process] A multi-dimensional analytical framework is constructed based on multi-source heterogeneous data. Quantitative indicators such as expansion coefficient and attention drift rate are proposed. Comprehensive modeling and case analysis are adopted to conduct empirical research, and a closed-loop intervention mechanism for intelligence perception is established.[Result/conclusion] Based on the analysis results, strategies for blocking cognitive illusions are proposed from three dimensions: algorithm optimization, user guidance and community governance, aiming to provide references for algorithm optimization, improvement of users' media literacy and public opinion risk governance.