Liquid desiccant dehumidification has large energy-saving potential in severe humid area. Electrodialysis regeneration is a novel and reliable liquid desiccant regeneration method, which can use the solar energy through photovoltaic panels and avoid desiccant droplets carried by supplied air from the environment during the regeneration. The current utilization coefficient and concentration increment are important performance evaluation indexes to reflect the mass transfer characteristic of the electrodialysis regenerator, which are influenced by the liquid desiccant flow rate seriously. This paper aims to acquire the current utilization coefficient and the concentration increment models considering the liquid desiccant flow rate. The results show that the current utilization coefficient increases with the desiccant flow rate within the desiccant concentration of 30 and 34%, while the increase of desiccant flow rate negatively affects the current utilization coefficient within the desiccant concentration of 38%. The current utilization coefficients are among 30 and 90% under experimental conditions. The concentration increment which are among 0.06 and 0.33% increases with the operating current and decreases with the liquid desiccant flow rate addition. The whole system coefficient of performance increases from 2.4 to 3.6 when desiccant solution flow rate varies from 80 to 160 L·h-1.