Public opinion dissemination simulation based on large language model multi-agent systems

The Internet has fundamentally reshaped the formation and diffusion of public opinion in modern society. However, existing simulation studies often face challenges such as insufficient fidelity in evolutionary dynamics, behavioral homogenization, and high modeling costs. This study develops a realistic public opinion simulation system that integrates macro-level diffusion patterns with micro-level individual cognition, addressing the traditional models' limitations in generalizability and high resource demands. This study proposes an LLM-based multi-agent simulation framework for public opinion dissemination. The framework first constructs behavior probability profiles calibrated against real-world social media data, following exponential and normal distribution models to constrain agent behavior frequency and topical tendencies (macro-dynamics). Concurrently, by utilizing an LLM as the cognitive core, the system enables dynamic semantic content generation via the integration of Public Opinion Simulation Standard Operating Procedure (PSOP) and a Global Information Sharing Pool (GISP) (micro-cognition). Comparative experiments across two distinct scenarios-"Public Policy" and "Food Safety"-show that (1): The framework exhibits significant cross-scenario robustness, replicating the incubation-eruption-decay' evolutionary pattern, which aligns with propagation dynamics without the need for parameter adjustment (2); Quantitative evaluation shows that the normalized agent behavior distribution entropy reaches 0.69; moreover the Distinct-2 metric for generated content reaches 0.83, substantially mitigating behavioral homogenization (3); Compared with traditional deep learning methods, this framework supports zero-shot cold start, with negligible computational costs for domain adaptation. By unifying the agent architecture, this research enables efficient simulation of public opinion evolution, providing a low-cost, high-fidelity methodological paradigm for public opinion crisis management.