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An anaerobic baffled reactor is a system developed in recent decades and has been used as part of the treatment of high-strength wastewater.Since the function of this system is based on its hydrodynamic features,hydrodynamics and the regime of the flow through the reactor are crucial.In this study,a prototype reactor with eight chambers,which had a total volume of 48 L,and a model reactor,whose dimensions were half of those of the prototype reactor,were used.The Froude dynamic similitude in these reactors was investigated.The results show that the curve dimensionless variances were 0.089 and 0.096 for the prototype and model reactors,respectively,the short-circuiting indices were 0.483 and 0.489 for the prototype and model reactors,respectively,the effective volume and short-circuiting index measurement errors were both 1％,the hydraulic efficiency error was 2％,and the Peclet and dispersion number errors were both 7％.Most of the compared indices were close to one another in value.Therefore,the model reactor can be used based on the Froude dynamic similitude to determine hydrodynamic characteristics of a baffled reactor at a full scale.