In this research, urea in swimming pools was treated by low-amperage electric current, and the influence factors including current density and chloride ion concentration and the mechanism of electrolytic removal of urea were investigated. Results indicated that urea was oxidized by active chlorine which was produced when there was high concentration of chloride ion in the solution with ruthenium-titanium as anode material and stainless steel as cathode material. No harmful by-product such as ammonia nitrogen or chloramines was produced. Urea possibly degraded into gases like N₂ and volatilized into the air. Current density and chloride ion concentration have great effect on the efficiency of urea removal. The removal of urea increased with the rise of current density and chloride ion concentration. Urea removal rate reached 99.5% at current density of 12 mA/cm² and chloride ion concentration of 400 mg/L by 30 min electrolytic treatment. Due to the high removal rate of urea by electrolysis treatment with no need of electrolyte, electrolytic removal of urea by low-amperage electric current is feasible for swimming pool water treatment.