Sweet watermelon is a cucurbitaceae plant,native to the African continent,and its cultivated species appeared in Egypt in 3000 BC.By 1200 BC,the sweet watermelon was spreading along the Mediterranean coast,where it became known as avattiah in Hebrew,pepon in ancient Greece,and pepo in Latin.By the 8th century,sweet watermelon had spread eastward to the Iranian plateau.In the middle of the 9th century,sweet watermelons ap-peared in Bukhara in the Fergana Basin of Central Asia.At present,the earliest known sweet watermelon remains in China were unearthed at the Tuokuzisalai site in Bachu County,Xinjiang,dating from the end of the 9th century to the beginning of the 10th century,which indirectly confirms the record of"the Khitan destroyed the Ouigour and ob-tained the melon seed"in the New Five Dynasties History and the Liao History Taizu Benji.