Wild Delphinium grandiflorum L.in Beijing was introduced and blossom character was observed.Pollen viability,stigma receptivity,pollen and ovule ratio (P/O) and OCI were examined,and artificial pollination test was developed.The results are as follows:(1)The inflorescence of D.grandiflorum had a raceme containing 3-15 flowers.The pedicel was 1.5-3.8 cm in length.The blossoming period of single flower and inflorescence were 10 d and 15-18 d,respectively.(2)The pollen viability increased at the early stage and decrease later in daily variation.The stigma had receptivity at 5-6 days after blooming and had no receptivity on the first 4 days.(3)Its P/O was 2 159.14,and OCI was 5.According to the artificial pollination test,D.grandiflorum could set seeds and the seed setting rate was 100% under natural conditions.The phenomenon of self pollination autonomy and partly self-compatible could be observed;furthermore.The seed setting was restricted by pollinators without apomixes.(4)The main visiting insects of D.grandiflorum were Amegilla (s.str.) quadrifasciata (Villers) and Eristalis arbustorum (L.).The research suggested that the breeding system of D.grandiflorum belonged to facultative xenogamy or obligate outcrossing,accompanied with partly self-compatiblity.The pollinator was necessary.