Abstract: The study on the mutual-aid interactions between ant and Kerria lacca Kerr in Yuanjiang County of Yunnan Province showed that after hosting, K. lacca could attract some ants to attend them. Before and after K. lacca hosting, the frequency of ants visiting Schleichera oleosa was 3.5 and 11.2 times· min^-1, and the numbers of visiting ants were 3-8 and 11-23 on one branch, respectively. The category of ants visiting Acacia montana had some differences, but for S. oleosa, it was absolutely different. Ants didn’t eat K. laccalarvae, and also, did not disturb the natural enemies of K. lacca. The attending of ants made K. lacca have more chance to survive, secret more lac by per female, and have bigger weight of female adult. Some specialized ants had mutual-aid relationship with K. lacca, but the category of ants changed with time and place. The behavioral mechanism of mutualaid interactions between ant and K. lacca was not just translated as supporting honeydew and utilizing it. Ants liked newly secreted honeydew, and the changes of the metabolism of host trees and the ratio of all components of honeydew could influence ant’s decision.

Key words: Closed polyculture, Penaeid shrimp, Tilapia, Constricted tagelus, Water quality