The subject of the paper is the theoretical and empirical analysis of the suspension generation particle-liquid, particle-gas-liquid systems in a stirred vessel. On this basis the model of suspension arising was proposed. The model has been constructed on the assumption of proportionality of kinetic energy of turbulent eddies and potential energy gained by the particles. The arising of suspension is due to turbulent eddies whose sizes are comparable with particle diameters and energy transferred to the particles from these eddies lifting them off the base. The effect of particle diameter and density module (Eqs. (24), (26) and (28)) on the critical speed and power mixing necessary to obtain complete suspension is in good agreement with experimental results obtained by other authors (Tables 1 and 2). In the model proposed the effect of solid concentration and the gas rate (in a three-phase system) on dispersed phase have to be determined experimentally.