Chrysin (9) is one of the representative flavonoids of propolis and was present in all EEP samples except EEP from Yunnan (q, r) and Hainan (s, t). EEP from Hubei (l) had the highest content of chrysin (9), while that from Gansu (h) had the highest contents of pinocembrin (10), galangin (11) and pinobanksin 3-acetate (12) among the EEP samples analyzed. Cinnamyl caffeate (13) was in large amount in that from Henan (k) (25.1 mg/g of EEP). EEP from Shanxi (g) had the highest content of tectochrysin (14) (42.7 mg/g of EEP).