Abstract: A large area of heavy saline-alkali bare land has been formed in coastal areas due to the sea reclamation,the existence of bare land has done great damage to the regional environment. In order to achieve the plant coverage of the heavy saline-alkali bare land,drip irrigation technology is used to create a micro-environment for plant growth,and its feasibility is verified by pot experiment. The effects of drip irrigation on plant growth and the changes of soil water,soil salt,pH and organic matter under the combined action of drip irrigation and plant growth are studied. The results show that（1）compared to atmospheric rainfall,drip irrigation on soil leaching can be ignored,but the effect on the growth of Suaeda salsa are obvious,drip irrigation can provide suitable micro-environment for Suaeda salsa sprouted,to ensure that the Suaeda salsa rapid growth in the rainy season.（2） The growth of Suaeda salsa increases soil organic and soil permeability,improves leaching efficiency,reduces soil water holding capacity,and contributes to the continuous improvement of saline-alkali land.（3） The pH value of the soil increases after leaching,and the pH value of the soil surface is lower than that of the bottom. The change of the pH value of the soil should be paid attention to when the plants are covered with heavy saline-alkali bare land and leaching of saline-alkali soil. The soil alkalinization should be prevented by applying the soil amendment when the pH value is too high.（4） A large amount of irrigation water supply will increase the plant height and total wet weight of Suaeda salsa in atmospheric environment,can also cause the waste of water resources at the same time. It is recommended to use treatment of experiment S₂（irrigation interval of 7 days in atmospheric environment）,which can not only ensure a better growth status of Suaeda salsa,but also avoid the waste of water resources. The research results can be used to guide plant coverage and soil improvement in heavy coastal saline-alkaline land.