Abstract: Soil salinization iw one of the issues that hunman being is facing, which was gravely effected plants to grow normally. An experiment using NaCl to induce 1/2 Hoagland water stresses was carried out to evaluate the effect on root and seedling growth of cucumber bean under slat-stresses , The result showed that (1) NaCl stress decrased plant height, leaf area, aerial parts of the fresh weight, total root number, total root length and root fresh wight of cucumber seedling. With the NaCl stress increasing, all of them are decreased except the aerial parts of fresh weight. (2) The chlorophyll content of cumcumber seedling increased remarkably under the NaCl stress. (3) The NaCl stress reduces the activity of cumcumber seedling roots’ SOD, POD, CAT. In addition the decrease range of SOD and CAT on enzyme activity of under ground portion was more than that of aerial portion. (4) The MAD content of cumcumber seedling was abviously increasing due to the increasing of NaCl stress concentration. (5) As the declining of antioxidase activity of cumcumber seedling roots, the membrance lipid peroxidation was enhanced, this ultimately lead to the inhibition of growth of cumcumber seedling root significantly.