Abstract: The growth and reproduction of Lilium dauricum, distributing in theNortheastern part of China in nature, was studied. Results showed thatpattern of growth and development in different habitat may be classifiedinto 3 types:the rigorous growth type, the type whose growth is some-what suppressed, but is still able to complete the life cycle, and the typeonly grows vegetatively, being not able to complete the cycle. Among the factors, affecting the development from one stage of thelife cycle to the other, light is an important limiting one. Under the ha-bitat of 46.6% of full light, most of L. dauricum plants are able to develop into adults, flower and fruit, thus complete the life cycles. But, inthe relative light intensity of 15.6% under forests, the probability of L.dauricum plants to become adults was very low. Du to long-term adaptation to the enviroment, L. daulicum developedtwo strategies of reproduction, In the habitat of full light or not lowerthan 46% of relative light intensity, sexual and asexual reproduction occur simultaneously. But, when the relative light intensity is lower than15%, L. dauricum mainly reproduces by bulds, which the exception ofthose under the intensive light. If the forest is disturbed, the plantsof L. dauricum immediately will flower and fruit, chang into sexualrepro-duction.

Key words: Lilium dauricum, growth, reproduction