Photosynthetic ecophysiological characteristics of Suaeda salsa seedlings under different salt condition were studied by carrying out the experiment of potted plants. The results showed that the photosynthetic pigment content of Suaeda salsa seedling leaves was significantly different from different salt environment. The net photosynthetic rate was decreased with the increase of salinity, which was caused by the stomatal limitation under high light intensity (PAR﹥1 400 μmol·m-2·s-1). The adaptability of Suaeda salsa seedlings to light under slight and moderate salt environment was high, but the Amax, LSP and LCP were significantly decreased under high salt environment, and Rd was significantly increased. The adaptability to high light intensity was decreased and the energy was subtracted by dark respiration. Suaeda salsa seedlings adapted the slight and moderate salt environment after a long period of evolution, and photosystem Ⅱ kept a high active, but the photosystem was damaged by high salinity.
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