Dunaliella salina was used as the stuff for our experiment, and f/2 culture medium were used as the culture medium. Set eight salinity treatments(15、20、25、30、50、70、90 and 110). And in two phases which the one before the salinity changed(A) and the other after the salinity changed(B), the growth status of Dunaliella salina under different salinity treatments were studied and some index were tested such as the value of OD、the content of chlorophyll-a and β-carotene、the content of dissolvable protein and carbohydrate. So the result showed that in the first stage(A), Dunaliella salina under some low salinity treatments(15、20、25 and 30) grew well, especially under the salinity treatment(20); but for the other ones, the salinity was higher, their growth were affected much more. In the second stage(B), when the growth of Dunaliella salina went to the exponential phase, the cell density, content of chlorophyll-a、β-carotene of this algae under the four salinity treatments(50、70、90、110 ) had all exceeded the one which grew under the salinity(20) treatment evidently. And at the end of the second stage(B), the content of protein and carbohydrate of Dunaliella salina under the salinity(15) treatment had increased compared with the one at the end of the first stage(A), but the content of protein and carbohydrate of Dunaliella salina grew under other salinity treatments had all decreased.
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