Taking Chlorides (Cl-) as the tracer, the residence time distribution (RTD) was adopted to study the effect of different HRT conditions on the hydraulic characteristic of A/A/O reactor and A/A/O filler reactor under the conditions of stable operation in water and sludge, and the results were compared and analyzed. The results show that the residence time distribution is only related with the reactor structure when there is no sludge in reactor;the diffusion of reactor is enhanced with the increasing hydraulic retention time;the actual average HRT of filler A/A/O reactor is more close to the theoretical HRT than that of A/A/O reactor;the volume utilization ratio of filler A/A/O reactor is higher than that of A/A/O reactor;when the HRT is 6 h, the dead zone volume rate of A/A/O filler reactor is minimum, that is to say the volume utilization ratio is highest.%以Cl-为示踪剂，采用停留时间分布法（RTD）研究A/A/O反应器和填料A/A/O反应器，在清水和有污泥稳定运行条件下，采用不同水力停留时间对A/A/O反应器和填料A/A/O反应器水力特性的影响，并进行了对比分析。结果表明，在反应器内没有污泥时，停留时间分布只与反应器结构有关；随着水力停留时间的增加，反应器的扩散作用有增强趋势；填料A/A/O反应器的实际平均水力停留时间比A/A/O反应器更接近理论水力停留时间；填料A/A/O反应器的容积利用率比A/A/O反应器高；当HRT为6 h时，填料A/A/O反应器的死水区容积率最小，即此时反应器的容积利用率最高。
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