The invention relates to a predacious mite feeding method by utilizing alternative preys, spider mites and thrips. The method is characterized in that in the process of feeding predacious mites through the alternative preys, the spider mites and thrips are added into a predacious mite feeding container once per week, and the spider mites and thrips are pure preys without any mediums and can by used independently or in a mixed manner. By the aid of the method, the large amount feeding problem of the spider mites and thrips can be solved, and the simple collecting method of the spider mites and thrips can be further provided. Even though the method is more complex in operation and higher in cost as compared with those of utilizing the alternative preys for feeding independently, according to the predacious mites produced by the method, the identification of the spider mites and thrips by the predacious mites is benefited, and the product quality of the predacious mites can be improved.