Insect virus preparations: highly specific parasitic range, not easy to cause damage to the ecological balance; can form inclusion bodies, especially nuclear polyhedrosis virus and granulomatous viruses, good stability; highly toxic to the target insects, can cause regional insect epidemics; there is no harm to the plant, and safety tests have proved that it is harmless to humans, livestock and aquatic organisms. At present, the insecticidal virus preparations applied in production are: kale nightshade nuclear polyhedrosis virus, cotton bollworm nuclear polyhedrosis virus, beet nightshade nuclear polyhedrosis virus, cabbage butterfly granulosis virus and so on. These insect virus preparations can be used to control pests occurring on medicinal plants, with good input-output as well as ecological and environmental benefits.