Abstract: The following laws have been obtained from the study on seed collectingperiod and storage method of Populus simonii, which has been carried outfor ten years: (1) The optimum period for seed collecting is the first andsecond ten days of june; (2)The optimum environment for prolonging theseed life low temperature,dry and air-tight conditions; (3) The life of seedsstored in normal environment is 1-2 years, while which can be prolonged to6-7 years as the seeds are stored in low temperature; (4) The suitable mo-isture content of seeds is 2-5% when they are stored.

Key words: Seed storage, Seed collecting period, Seed germination rate, Weight per 1, 000 seeds