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A new dammarane-type saponin, named jujuboside A2, three known saponins, and a known sesquiterpene glucoside, (1R,3S,5R,8S,2Z,4E)-dihydrophaseic acid 3-O-β-D-glucopyranoside as well as eight known flavonoids were isolated from the seeds of Zizyphus jujuba var.spinosa.The structure of jujuboside A2 was established as jujubogenin 3-O-β-D-glucopyranosyl(l- 6)-[β-D-xylopyranosyl (1→2)]-β-D-glucopyranosyl(11→3)-[6-deoxy-α-L-talopyranosyl (1→2)]-α-L-arabinopyranoside by means of chemical and spectroscopic methods.This is the first time that a sesquiterpenoid has been isolated from the genus Zizyphus.Two flavonoids such as hovetrichoside C and camelliaside were also isolated for the first time from this plant.Three major saponins, jujuboside A, B and A , showed inhibitory activity on platelet aggregation.