Abstract: The accumulation and transport of arsenic (As) in typical wetland plant Typha angustifolia L. were investigated in seedling, flowering, and yellowing stages under various As stresses (0, 50, 100, 150, 200 and 400 mg/kg). The effect of As stress on plant growth and development, plant As accumulation and soil As transportation of three growth stages was examined. The results showed that:(1) Typha angustifolia L. growth was increased by low As while decreased by high As and the highest biomass production was obtained at 100-150 mg/kg As. Typha angustifolia L. showed toxic symptoms under 400 mg/kg As but can still complete its life cycle. Typha angustifolia L. in different growth stages showed different As tolerant abilities. Plant sensitivity to As stress decreased with increasing growth period, showing increased As tolerance. The greatest As tolerance was observed in flowering stage, with tolerance index being increased by 54.0% in the 100 mg/kg As treatment compared the control. (2) The As distribution in different plant tissues was dose-dependent. Shoot As concentration was higher than the root in seedling, flowering and yellowing stages, leading to the transport coefficient < 1. However, the As accumulation and transportation efficiency in plants were different in three growth stages, with the highest in flowering stage and lowest in browning stage due to the biomass dilution. (3) Arsenic removal from soil was greater than that being fixed by Typha angustifolia L. under As stresses. The As transport efficiency was in order of flowering > yellowing > seedling stage. Therefore, collecting plants in flowering stage helps the greatest restoration of As-contaminated soils and/or sediments. The results showed that the emergent plant Typha angustifolia L. has strong tolerance to As and various As accumulation and transportation abilities in different phenological stages. It's performance and mechanisms in As-contaminated wetland sediment remediation deserve further studies.