The aim of the paper is to show on of the soil strengthening technologies – mass mixing. Two variations are to be distinguish – dry and wet type. The application of each type is dependent of the type of soil and its moisture content. The paper describes case studies of dry type: S5 road in the section Korzeńsko Widawa, open pool complex in Oława, Szczecinek bypass. Wet type case study is described as well – part of the “Wiślanka” gallery in Żory. The analysis of mentioned case studies has shown that the technology can be used in all type of civil engineering objects. While it is one of the technologies which is based on mixing of the existing soil, it is especially important to do comprehensive soil investigation and trial mixes before the start of the jobsite. On of the advantages is that the quality control in case of wet mass mixing is made similarly to DSM. Keywords: geotechnics; soil strengthening; mass mixing.