General entomolog, also known as basic entomology, focuses on exploring the life forms and laws of insects themselves. It mainly includes: insect morphology (sect morphology), insect biology (sect biology), insect behavior (sect taxonomy or sect taxonomy), insect physiology (sect physiology), insect ecology (sect ecology) and so on. English is forest entomology, which studies the occurrence regularity and control methods of pests in living trees, seedlings and bamboo.

Medical entomology studies the occurrence regularity and control measures of pests that directly parasitize, sting, harass and intimidate human beings, pollute human food and spread human diseases. In English, it studies the pathological changes, diagnosis and epidemic law of insects caused by parasitic bacteria, fungi, viruses, microsporidia, nematodes and other parasites. It provides a basis for improving the efficiency of biological control.

In addition, applied entomology includes fruit tree entomology, vegetable entomology, stored product entomology, resource entomology, extension entomology (extension entomology), sericulture (sericulture), apiculture and veterinary entomology.