Sweet horn, also known as tamarind and "Han Mu" (Dai language), belongs to tamarind. Its ripe fruit is brown and sweet, similar to the taste of dried longan. Sweet horn pulp is rich in calcium, phosphorus, iron and other elements, among which the calcium content ranks first among all fruits. In winter and spring, the sky is clear and clear. Walking into the Dai village in Xishuangbanna, it's easy to see a kind of fruit tree that the local people especially like-sweet horn. Its tree is tall, its trunk is rough, its branches are sparse, and a string of brown hooked pods are hung on its branches.