A knowledge of hydrodynamic characteristics is important because it helps in design, control, analysis, optimization, operation, and modelling of the system, which enhances the performance of process unit. This paper aims to provide the evaluation of the techniques of flotation and design parameters, which is required to improve the separation efficiency of the flotation processes. Different components of flotation columns, flotation mechanism and design parameters like flow regime, gas holdup, bubble size and its distribution, mixing characteristics and carrying capacity are critically discussed. The measuring techniques of design parameters for flotation process are also described. The present article on flotation technique and its research components may provide in hand information on the flotation process to the researcher and designer of flotation unit.