Soil suction is the most relevant soil parameter for characterization of the swell behaviour. An attempt has been made to predict the swell pressures from soil suction measurements. Bentonite-Kaolinite clay mixtures were prepared to obtain soils in a wide range of plasticity indices. Suction measurements using thermocouple physchrometer technique and constant volume swell tests in oedometers were made on statically compacted specimens. Soil suction is correlated to plasticty index, water content and dry density and a multiple regression equation were developed. A linear relationship is found between log suction and the swell pressure. However a satisfactory correlation between initial soil suction and the swell pressure does not exist to propose a simple regression equation for a quick prediction of swell pressures from suction measurements.