The　water　consumption　intensity　of　steel　production　through　BF-BOF　technology　was　decomposed　by　an　innovative　process-based　water-accounting　model,　i.e.,　water-balance　model.　One　ton　of　steel　product　was　chosen　to　be　the　functional　unit.　The　system　boundary　of　the　case　study　included　the　production　processes　of　coking,　sintering,　iron　making,　steel　making,　continuous　casting　and　rolling.　The　results　showed　that　the　water　consumption　intensity　of　steel　production　was　3.969t/t　in　this　case.　The　water　consumption　of　evaporation,　solidification　and　wastewater　were　2.373t,　0.013t　and　1.583t,　accounting　for　59.79%,　0.33%　and　39.88%　of　the　total　water　consumption,　respectively.　Steel　rolling　is　the　largest　contributor　to　water　consumption,　and　the　amount　of　water　consumption　is　1.523t,　accounting　for　38.37%　of　the　total　water　consumption;　followed　by　coking　process　and　continuous　casting　process,　the　amounts　of　which　are　0.814t　(20.50%)　and　0.634t　(15.97%),　respectively.　This　finding　can　push　the　utilization　of　advanced　technologies　to　save　water　resource　in　steel　industry.　©　2020　Trans　Tech　Publications　Ltd,　Switzerland.