Watermelon is a kind of foreign crop.Its spread,promotion and popularity not only brought China an excellent fruit,but also enriched the original folk cultural life of traditional festivals.Many Chinese traditional folk festivals,such as Chinese New Year(Spring Festival),the Lantern Festival,Dragon Boat Festival,New Crops Recommendation,Beginning of Autumn,Chinese Valentine’s Day,Hungry Ghost Festival,the Mid-Autumn Festival,and so on,have all absorbed and combined elements of watermelon to different extent.Investigating the reasons,watermelon fits the purposes and demands of traditional Chinese Folk Festivals at least in biological features,ripening time and ecological character.Watermelon traditional festival folk culture is a very important agricultural cultural heritage,so its cultural value and social significance deserve our attention,and an effective protection,inheritance and development of the culture should be ensured.