The　chromium　in　industrial　wastewater　could　be　removed　with　the　scrap-iron　fixed　bed　reactor.　The　metal　was　removed　through　electrochemical　reaction,　with　scrap-iron　electric　enrichment　for　flocculate,　catalyst　function　and　coagulation　of　cell　reacting　products.　Flocculate　adsorbed　and　filtrated　the　bed　layer.　Results　showed　that　the　optimum　technical　condition　was　as　follows:　pH　=　6.0-6.5,　HRT　=　7　h,　continuous　aeration,　with　the　amount　of　0.2　L/min.　Chromium　wastewater　treatment　through　scrap-iron　fixed　bed　operated　steadily,　and　the　removal　rate　was　high,　so　the　effluent　can　reach　the　discharge　standard　of　China.