Among the kites in Beijing, there is a most representative one with the best performance, which is "Sha Yan Er" shaped like the Chinese character "da".

The head of "Sha Yan Er" is the plane deformation of a swallow's head. Together with the scissors-shaped tail, it makes people think of swallow. The structure of it is concise. The main skeleton is composed of five bamboo canes. Its wings are bent at the end of the upper and lower bamboo canes to form a special-shaped "wing pocket", which makes it fly up when the wind is light and makes it stable when the wind is strong. Its flight performance is superior to other types of kites.