A　new　semiterpenoid　glycoside,　3-methylbutan-1,　3-diol-1-O-beta-D-glucopyranoside　(1)　and　a　new　benzofuran　derivative　glycoside,6-carboxylethyl-benzofuran-5-O-beta-D-xylopyranosyl-(1　-＞　2)-beta-D-glucopyranoside　(2),　together　with　seven　known　compounds　(3-9)　were　isolated　from　the　roots　of　Heracleum　dissectum　Ledeb.　Their　structures　were　elucidated　on　the　basis　of　physicochemical　properties　and　the　detailed　interpretation　of　various　spectroscopic　data.　All　the　isolated　compounds　were　screened　for　anti-inflammatory　activity　in　vitro.　And　the　result　showed　that　compound　2　exhibited　significantly　inhibitory　activity　on　nitric　oxide　production　in　RAW264.7　cells,　which　IC50　value　was　equivalent　to　that　of　the　positive　control　indomethacin.