Especially in seismically active regions and country, liquefaction is one of the important problems in geotechnical earthquake engineering. Many developments have taken in the research on liquefaction of soils in since fifty years which has resulted in better understanding the soil liquefaction. Liquefaction, in 1960, was primarily associated with grained saturated cohesionless soils and soils with fines were considered non-liquefiable. After the earthquakes that occurred in the 1970s, fine-grained soil liquefaction sensitivity is also observed. Many authors investigated the liquefaction behavior of silts, silt clay, sandy silt and sandy clay mixers over a range of plasticity values of interest by conducting cyclic triaxial tests, cyclic simple shear and torsional shear on undisturbed as well as reconstituted samples and their behavior was compared with that of sand. This paper will highlight a number of important past fifty years and ongoing study in soil liquefaction. © Sila Science.