Abstract: Harmonia axyridis, one of the most important predatory natural enemy in agriculture and forestry. Understanding the bioecological characteristics of H.axyridis is an important prerequisite for scientific use of it for biological control. This paper summarized the research progress of H.axyridis, focusing on its life morphological character, history, predation ability and application. The analysis concluded that environment and food were two major factors affecting the growth and reproduction of H.axyridis. In addition, H.axyridis can prey on the eggs and larvae of various lepidopteran insects other than aphids.