Abstract: The research showed that the satus rate of 2nd-year Lilium pumilum with stooling and without stooling are respectively 47.66% and 38.79% , and the blooming rate for 2nd-year cultivated plants is 13.55% in term of cultivated condition. All the plants of 3rd-year and 4 th-year L. pumilum can bloom, but the flower quantity has a positive correlation with the age of p lants. The ratio of pollen to ovule is 164.9 -175.2 for cultivated plant, and 284.4 - 315.6 for wild plant, so the breeding system is facultative selfing. In full sun, relatively reproductive rate of the cultivated plants has positive relation with the age of the p lant. For the 2nd-year plants, relatively reproductive rate of the plants with the condition of full sunlight is 7.5 tines as that which grow under forest. Wild L. pumilum has the same relatively reproductive rate as the cultivated 2nd-year L. pumilum. which grows in full sunlight. It is discovered that the pollination acts on the stigmata 5 days before L. pumilum flower. The plants pollinated 1 day before flower bear luxuriantly. L. pumilum has no multi-parent effect, and the setting percentage and the seed yield for single parent is higher than that formulti-parent. The fruit-set rate of the plants with natural pollination is about 2 times of that with illegitimate pollination and self-pollination. The pollen which comes from L. daurucum and L. cernum heavily affects the natural reproduction of L. pumilum.

Key words: Lilium pumilum, Breeding system, Pollination, Interference reproduction