In this paper, seeds ofpinus koraiensis which has a characteristic of deep dormancy were selected as an experiment material, and the relation of cellular substance exudation to seed vigour is discussed based on the dormant state, the different measuring parts and the imbibed state of seeds before testing, as well as on the respiration of embryo and endosperm. The major measured results are as follows: (1) After soaking for 24h, the dry embryo conductivity of seedlot L is greater that than of seedlot H: (2) The substance exudation of dry embryo of seedlot H is less than that of seedlot L; (3) After seeds imbibed, the substance exudation of dormant embryo of seedlot H is more than that of seedlot L; (4) After germination hastening treatment, the substance exudation of H embryos is greater than that of L embryos; (5) After artificially accelerated ageing treatment, the embryo conductivity of imbibed seeds has a positive correlation with seed vigour.