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Background: This research focuses on the simulation techniques for the migration and diffusion of aircraft radioactive material, evaluating the applicability and simulation performance of various modules. Materials and Methods: A multiscale meteorological forecast simulation was developed to provide grid wind fields for dispersion modeling. In collaboration with the National Nuclear Emergency Response Technical Support Center, the China Institute for Radiation Protection has successfully developed the Nuclear Accident Consequence Assessment and DecisiOn Support System (NACADOS). This system, which has independent intellectual property rights, is specifically tailored to China’s national conditions and incorporates multiscale response capabilities for nuclear accident consequence assessment. This system also includes diffusion modules applicable to various evaluation scopes and environmental conditions. Results and Discussion: The effectiveness of the module’s assessment was validated through comparisons with on-site monitoring data, high-quality tracer experiment results (e.g. , European Tracer Experiment, Urban2000), and simulation outcomes from other consequence assessment systems (e.g. , Java-based Real-time On-line Decision Support System [JRODOS] and Radiological Assessment System for Consequence Analysis for radiological emergencies [RASCAL]). Furthermore, the functionality, performance, and effectiveness of the NACADOS system were rigorously tested through physical module validation, system testing, and engineering software testing. Conclusion: The NACADOS system meet the demands of radiological consequence assessment and response for nuclear and radiological emergencies worldwide, significantly enhancing nuclear emergency response capabilities.