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Avian Influenza (AI) can cause extremely high mortality in infected fowls, and the factors affecting its maintenance and infectivity in aquatic environment is still unclear. In this study, effects of ultraviolet (UV) irradiation, heat-sensitive materials and particle materials on influenza A virus infectivity in aquatic environment were analysed under laboratory condition. Influenza A virus was sensitive to both of the ultraviolet B (UVB) radiation and ultraviolet A (UVA) radiation. UVB may led to viral inactivation through both of the genome and protein damage, while UVA may inactive the influenza A virus through endogenous indirect inactivation. Heat-sensitive materials plays important role in influenza A virus decay process and contributed 8.7-25% to viral decay ratio. The particle material concentrations significantly affected the influenza A virus decay process. With the particle material concentrations increased 5 and 10 fold, the decay ratio increased from 22.56±2.35% to 55.67±2.08% and 70±2% respectively. [ABSTRACT FROM AUTHOR]