Based on the process-level micro data, this paper adopts the SBM model considering the undesirable output to calculate the green technical efficiency (GTE) of 31 Chinese iron and steel enterprises (CISEs) in 2008 and 2012 as well as the efficiency of three main production process in the steel production, such as sintering, ironmaking and steelmaking. Based on this, the correlation between different types of environmental regulation and the GTE of CISEs is further discussed. The results show that: (1) Compared with sintering and ironmaking, the ...