Baolia Kung et G. L. Chu was established on the basis of Baolia bracteata Kung et G. L. Chu described in 1978 from Diebu County on the border between Gansu and Sichuan provinces, China. However, its systematic position has not been resolved at the molecularlevel. This study analyzed the nuclear DNA (ITS) and chloroplast DNA (atpBrbcL, rbcL) markers of 48 species belonging to 32 genera (including Baolia) of the family Amaranthaceae, constructed the molecular phylogenetic trees of Amaranthaceae and discussed the biosystematic relationship of Baolia. The results indicate that: 1. Baolia is nested within the subfamily Chenopodioideae Burnett; 2. Corispermum L. and Baolia diverged from each other from the Late Oligocene to the Middle Miocene; 3. Corispermeae Moq. and Chenopodieae Dumort. have a close relationship.