Euseius spp. are abundant, widely distributed and very important biological control agents that play an active role in suppressing pest insects, or mites, such as thrips, spider mites and gall mites. Advances in research on this group both at home and abroad are summarized, including research on its biological and ecological characteristics, mass rearing, release and application in pest control. So far, research on Euseius has been sporadic and nonsystematic, and not enough has been done on their biology. The difficulty of rearing Euseius spp. has become a bottleneck for their application as biological control agents. Research on the mass rearing of Euseius spp. should be intensified.