Epimedium koreanum Nakai is a long rhizome perennial plant distributed throughout Northeast China, the North Korea Byland and the Russia Far East. Samples and observations for this study were obtained on the southwest foot of Changbai Mountain, Southeast Jinlin Province, China. The geography location is 126°11′E ~127°35′E, 41°27′N~42°4′N. Here forest coverage rate is 83.4%, and climate is wet continental monsoon climate, annual average temperature is 56℃, annual precipitation is about 800mm. The samples were collected from three plots (Quercus mongolica forest, Juglans mandshurica forest and Secondary mixed forest ) differing in air temperature, light intensity, crown density, humidity and soil moisture. In the three plots, Epimedium koreanum Nakai is a partial dominant with bigger population area in the herb layer. The results show that the sexual reproduction of Epimedium koreanum Nakai is low; abloom rate and fruit rate are 2% and 0.8%, respectively. Reproduction of the rhizome plant is largely asexual. Asexual reproduction energy peaks at age 2 and decreases each year after that. By age 5 the rhizomes no longer have asexual reproduction energy. The amount of bud on Epimedium koreanum Nakai is redundant, and the redundancy rate increases with increasing age of the rhizome and poorer habitat. In addition, the coefficient of variation in abloom rate, fruit rate, bud amount and age one rhizome amount also increase noticeably with aging rhizomes and poorer habitat. Poor habitat conditions induce population multiplication uncertainty and plant instability. Epimedium koreanum Nakai’s low seed bourgeon combined with habitat loss from long excessive use could cause the plant to become endangered. The study and control on intensity and fashion for its use is advertised.