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Four kinds of polysaccharides (FA, FB, FC and FD) were extracted and purified from a red alga Furcellaria lumbricalis. Their monosaccharide composition, average molecular mass ((M)w) and structural feature were determined by gas chromatography (GC), high performance gel permeation chromatography (HPGPC) and Fourier transform infrared spectroscopy (FTIR),respectively. The results showed that FA and FB were composed of galactose (Gal), 3,6-anhydro-galactose (AnG) and 4-sulfated-galactose (G4S), which were structurally similar to β-carrageenan and κ-carrageenan. FC was composed of sulfated galactose and small amount of AnG, indicating that it was a hybrid-sulfated galactan. FD was composed of α -1,4-glucose and belonged to floridean starch. The respective yields of FA, FB, FC and FD were 4.84%, 33.74%, 8.76% and 13.5%, and the corresponding (M)w were 537 kD, 432 kD, 513 kD and 51 kD respectively. Owning to its high content (＞60%) of polysaccharide, F.lumbricalis will be a good source of marine sulfated polysaccharide and shows its potential utilization in food and medicine.