Recent developments in the field of concrete technology have led to the creation of environmentally friendly concrete, and since there is a lot of carbon dioxide produced in the Portland cement production process, a new cement called geo-polymer cement, with advantages such as cheaper price, less polluting and proper mechanical properties, can be a good solution. In this research, the compressive strength of geo-polymer cement and the possibility of replacing it instead of Portland cement in concrete have been investigated. Choosing the appropriate precursor is one of the most important stages in the construction of geo-polymer mortars. In this paper, the compressive strength and factors affecting it in a geo-polymer mortar with a variety of precursors such as metakaolin, fly ash, nano silica and granulated blast furnace slag have been investigated. Compressive strength of geo-polymer mortars after 3, 7 and 28 days at various treatment temperatures is based on fly ash, metakaolin, slag in the range of 25 to 62 MPa, which has a good strength compared to the mortar made Portland cement shows. Also, using nano silica materials on geo-polymer mortars with metakaolin base, increasing its percentage by weight from 0 to 6% increased the compressive strength by about 30%. Finally, the feasibility of using these precursors in Iran has been investigated.