Abstract: The identification of the physalien in the Fructus Lycii was studi ed by TLC, HPLC and GC.The stability of physalien was also studied in this paper .The results showed that the physalien was the product of the zeaxanthin esteri fied with two molecular palmic acid.The physalien was stable to heating acid a n d oxidant,however,it was very sensitive to light and Cu2+.

Key words: Fructus Lycii, physalien, identification, stability