Abstract: This experiment studies the efficiency of N₂H₄·H₂O,NaHSO₃,N₂H₄·H₂O—NaHSO₃ and N₂H₄·H₂O—NaHSO₃—accessory agency and four chemical reagents on treating chromeplating wastewater. Results show these chemical treating reagents are able to treat chromeplanting wastewater, and realize the chromeplating wastewater recycling in slot-side. That makes out a new technology combining wastewater treatment process with electroplating production process. Unlike the traditional end -of-pipe control methods, this new technology will get obvious economical and environmental benefits without additional investment.