Lac insect, wax scale and gall aphids are the important resource insects in China. Host plant is not only the habitant and reproductive sites for resource insects but also their food resource. The species of host plant are various, and some of them are excellent hosts. The host plant species were extensively collected from the major production regions of lac, wax and Chinese gallnut, and then reproduced in Jingdong of Yunnan where locates in the southern subtropical region. It has been conserved in the Arboretum of Jingdong Trial Station by Ex situ conservation. More than 200species, which belong to 98 genuses,36 families of host plant of lac insect, wax scale and gall aphids have been collected over many years. These species are valuable materials available for studying these resource insects and their host plant. From these species, it is possible to develop excellent hosts that can be put into use in production. Also these species is the basic materials to be used in host plant breeding and enhancement and research on their multiple utility. The study was conducted during the period of 1993～1999, and its major results are reported.