The genus Rosalia contains three subgenera of which distinctly divided by different body colors and distributional patterns. Eurybatodes is a monotypic subgenus with yellow tegument only found in Yunnan, China. Eurybatus is the most specious subgenus contains 21 species with reddish body color, widely distributed in Oriental region including Taiwan and Ryukyu islands. The blue subgenus Rosalia contains 5 species that distributes West Palaearctic, East Palaeartic, Japan, Oriental and West Nearctic, respectively. Here we present the ongoing research on multi-gene phylogeny and evolutionary studies of the genus Rosalia. This study provides new insight into the internal relationships and the evolutionary history of various traits (e.g. biogeography, colors, elytral patterns) of the genus Rosalia.