Abstract: Accumulation of carotenoid, cell protein, polysaccharose and proline in autotrophy or polyculture Chlorella vulgaris as well as its growth characteristics under NaCl stress were studied in this paper. The results indicated that the content of biomass, polysaccharose and MDA for polyculture Chlorella vulgaris was significantly superior to that for autotrophy Chlorella vulgaris, while the content of carotenoid, cell protein and proline content was significantly inferior to that for autotrophy Chlorella vulgaris, which illustrated that autotrophy and polyculture Chlorella vulgaris both had certain resistance to salt stress, but the pattern manifestation to resist salt stress was different between each other.

Key words: Chlorella vulgaris, autotrophy, polyculture, salt stress