Three new biflavonoids,2,3-dihydroisocryptomerin (1), delicaflavone (2),and 2,3-dihydrorobustaflavone 7,4',7”-trimethyl ether (3),as well as a known biflavonoid chamaecyparin (4) were isolated from Selaginella delicatula. The structures of these compounds were established by spectroscopic analysis and chemical modification.