Constructing photovoltaic power stations in steel companies which have large electricity consumption and abundant roof resources can not only use resources efficiently, but also reduce environmental pollution. To illustrate the feasibility of installing photovoltaics in the steel industry, a distributed photovoltaic power generation system is designed for a large scale steel enterprise. The results show that the company has the capacity of installing 15 MW photovoltaic power station with an average annual power generation of 17.601×106 kW·h. The project can save standard coal 7 040.4 t/a and reduce carbon emissions 4 787.5 t/a, CO2 emissions 17 548.2 t/a and its payback period is 7 years, which has a good investment potential.