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Parthenium hysterophorus is an alien weed with strong invasiveness and spreading rapidly in southern China, and Junan in Shandong province.The successful invasion of this weed might be related to its reproductive traits and strong adaptability of seed germination to environmental conditions.We studied the reproductive capacity and seed germination characteristics of P.hysterophorus in greenhouse and laboratory experiments.The results showed that P.hysterophorus could reproduce clonally mainly through stems.However, its sexual reproductive capacity was much stronger.A single mature plant could produce approximate 10 thousands of seeds.Seed germination of P.hysterophorus was affected by environment factors.Acidic conditions could accelerate its seed germination, and it was the best when pH was 6.It did not require any additional nutrition and P contention for germination, but the percentage of germination was significantly decreased as the salt concentration increase.The germination could be inhibited by the buried treatment and no seedling emerged when seeds were planted 2.0 cm deep.