A b s t r a c t. The seeds of two pea varieties Bohatyr and Junak were separated from the cropstand during the ripening. The biological seed moisture content ranged within 70-10 %. In relation to the decreasing seed moisture content the changes of size and weight characteristics, coefficient of restitution after the re-bound from wooden, concrete and steel plate, were in-vestigated. The changes of force causing the mechanical seed destruction were measured by using of compression testing device INSTRON 1112 as effected by seed moisture content and loading-force direction.