Serangium japonicum Chapin is an important species of predatory ladybird and has been used as a biological control agent for the tobacco whitefly Bemisia tabaci (Gennadius) and other agricultural pests. This paper summarizes recent progress in research on the biology and ecology of S. japonicum, including morphological characteristics for identifying the species, prey species, life history, population dynamics in the wild, behavior, and utilization on biological control. Further studies on combining S. japonicum and plant traps for B. tabaci, artificial mass-rearing, and the mechanism for S. japonicum to identify odors are proposed.