The core of PCO is integrated pest control, that is, from the overall concept of pests, environment and social conditions, according to the principles of treating both the symptoms and root causes, effectiveness, economy, simplicity and safety, paying attention to the root cause, including the principle of being harmless to the environment, taking appropriate environmental control, chemical control, biological control or other scientific and effective means according to local conditions, forming a set of systematic pest species control measures to control its population density at a level of insufficient harm. And strive to eliminate it, in order to achieve the purpose of eliminating pests and diseases or reducing interference. Not the traditional way of spraying, spraying and spraying. Pest control or pest control is an industry, which is a service industry to effectively control harmful insects and other animals that endanger human health and disturb the living environment. The core of PCO is integrated pest management, that is, taking pests and their habitats as a whole, considering social conditions, adopting reasonable environmental control, physical control and chemical control comprehensively.