Increasing the habitat diversity and stability of agro-ecosystems by crop genetics and species diversification has been a focus in agricultural research and an increasing trend in insect pest control. However, the mechanisms involved and degree of pest reduction are dependent on a thorough understanding of the behavior of the relevant insect species. Phytophagous insects’ host location, mating, movement, oviposition, and feeding behaviors are disturbed in diversified cropping systems. The effect of diversified cropping on phytophagous insect behavior, as well as current research problems and future perspectives, are discussed in detail based on domestic and foreign research reports.