The paper is a review on the biological methods for plant protection against harmful organisms. Natural parasites limited attack in the field and can accompany pests and in protected spaces. Introduction and acclimatization of beneficial organisms remain the main method of combating the pest species. Currently, many countries have developed programmers for the biological control with very good results. Production of the majority species is sustained by state programs. At present time more than 150 species of predator and parasitic arthropods are being reared in the world. The main problem of commercial biological method remains ensuring adequate and quality pest control.