This study was conducted to know the effects of temperature and gibberellic acid on the dormancy block-ing of ginseng seeds at different embryo growth stage. Optimum temperature for embryo growth appeared to be I soc at the beginning stage of post ripening (up to dehiscent time), 1$0^{circ}C$ at middle stage (for 30 days after dehiscence) and 5$^{circ}C$ at last stage (between 30 and 92 days after dehiscence). And optimum temperature for dehiscence is about 17$^{circ}C$, also the optimum temperature for dehiscence is higher than that of embryo growth. Germination of ginseng seed with full grown embryo was accelerated at high temperature (25-3$0^{circ}C$). Germina-tion percentage was 80% at 105th date after dehiscence under 5$^{circ}C$, 28% at 147th date under 1$0^{circ}C$, but no germination under the over 15$^{circ}C$. Gibberellic acid increased the dehiscent rate, whereas the gibberellic acid treatment may not be substituted for effect of low temperature on the germination. Low temperature may be reguired to finish the embryo growth in thickness.