Two new cyclic peptides, dianthins G–H (1 and 2), together with the known dianthin E (3), were isolated from the traditional Chinese medicinal plant Dianthus superbus. The sequences of cyclic peptides 1 and 2 were elucidated as cyclo (-Gly1-Pro2-Leu3-Thr4-Leu5-Phe6-) and cyclo (-Gly1-Pro2-Val3-Thr4-Ile5-Phe6-), on the basis of ESI tandem mass fragmentation analysis, extensive 2D NMR methods and X-ray diffraction. The isolated three compounds all increase proliferation of MC3T3-E1 cells in vitro using MTT method.