Abstract: Seeds of Pinus massoniana stored in bags under room conditions areapt to deteriorate, and the germination rate and vigour index of the seeds reduced significanlly. The ultrastruetUre of the deteriorated seeds damaged seriously. Both the organelles and membrane system destroyed. The mitochondrion is very sensitive to the deterioration. The nucleus, endoplasmie reticulum, and the microsomes degraded. In the cells of non-viable seeds, the spheresomes fuse into groups so that organelle was very dificult to be distinguished. On the contrary, the seeds stored in hermetic vessels have sound cell ultrastructure with various organelles and intact membrane system. It seems reasonable to assume that the seeds of Pinus massoniana should be stored in hermetic containers at low temperature to save their vitality.