In order to achieve environmental safety, crop health and benefit improvement, there is a need to improve the sustainable effect of natural enemies and biological control measures against diseases, pests and weeds through the construction of polyculture system, which is the developing direction of modern agriculture. The research and application of interplanting and retaining the compositaceae weed Ageratum conyzoides in citrus orchard for pest control were summarized. The sustainable control of important pests such as citrus red mite, Panonychus citri, was achieved by improving the microclimate conducive to the stability and development of predator mite population, enriching the food source and habitat of predator mite, and increasing the safety of predator mite migration between plants and the possibility of long-distance activity. The relevant technology has been widely used in citrus orchard, and substantial ecological and economic benefits have been achieved.