A day without IT is like a day without sunshine, because IT plays a crucial role in human life and industry in the whole world especially towards industrial revolution 4.0. However, the evolution of IT became one of the contributors to the Carbon Dioxide (CO2) emission that cause global warming. Therefore, Green IT had being introduced; however, most of previous researches were focus more on the implementation of Green IT in an organization rather than IT user context. The objective of this paper is to identify the criteria to assess Green IT practice among IT user. Systematic literature approach which consists of seven phases had being used to identify the criteria. As the finding, three main criteria had being identified: IT sourcing, IT operation and IT disposal. Each of these main criteria had sub-criteria which can be used to identify how green is an IT user.