The effects of groundwater depth and mineralization on the photosynthetic characteristics and growth of T． ramosissima were studied in the treatments with factors of mineralization ( ＜1． 00，1． 0 ～3． 0，and 3． 0 ～10． 0 g/L) and groundwater depth (20，60，and 100 cm) for a duration of 60 days in the national research station of Akesu oasis farmland ecosystem． The results indicate that the combination of groundwater depth and mineralization showed signifi- cant effects on the photosynthetic characteristics and growth of T． ramosissima seedlings． According to the results ob- tained from the experiment，it was found that with groundwater at 20 cm depth and saline condition，the plant showed the highest maximum photosynthetic rate〔66． 93 μmol/(m2·s)〕，stomatal conductance，water use efficiency and carboxylation efficiency． The values of maximum net photosynthetic rate，apparent quantum yields，light saturation point and dark respiration rate were affected by the variations of groundwater depth and mineralization． These results revealed that with 20 cm watertable and saline condition，the seedlings of T． ramosissima show stronger competency and have higher capacity to accommodate the variations of the environment．