Improper selection of glutinous rice, insufficient cooking time and moderate viscosity.

1, insufficient steaming time: if the steaming time is insufficient, Baba will be steamed incompletely, which will lead to steaming collapse, so it is necessary to increase the time.

2. Improper selection of glutinous rice with moderate viscosity: If you choose glutinous rice with too high or too low viscosity, it will easily lead to the collapse of leaves after steaming.