The dispersive agent has the feature of dispersing soil particles and breaking interparticle forces. The solution of dispersive agent and water used in a wet sieving process in ratio 2 g / l of water. The motivation of this research is to check whether the soil mixed using such a solution can be later used to determine Atterberg's limits. Atterberg's limits represent the critical water content of fine grained soils. The liquid limit is water content at which the soil sample starts to flow when it is shaken and plastic limit is water content at which observed soil sampe can not be changed without disrupting the continuity of the material. This paper determines the influence of dispersing agent on the Atterberg consistency limits. For the purpose of this paper, as dispersive agent it was used sodium hexametaphosphate with chemical formula (NaPO3)6. Tests for detemination of Atterberg limits were conducted in labaratory on four different soil samples (Kaolin, Slani Potok, Veli Dol – Vinodol and Crvenica) with four different solutions of dispersive agent and water (0 g/l, 0,01 g/l, 2 g/l i 40 g/l ). After the laboratory determination of the consistency limits, the soil classification was carried out according to the principles of the European soil classification ESCS.