The front chest of Acridoidea has a developed back plate, which is saddle-shaped and covers the middle chest. 3 hocks with hock pads. The auditory organs of tympanic membrane are located on both sides of the first abdominal segment, and the male insect can pronounce, which is caused by the friction between the hind leg segment and the outer edge of the front wing. However, a few species with no wings or severely degraded wings do not have hearing devices and pronunciation devices. Phytophagy, many species are important pests in agriculture and forestry. Eggs are laid underground in the form of oocysts. Nymphs are 5 years old. There are more than 6,543.8+0 million species in the world, and more than 700 species in China.