Among the measures of saline-alkali land improvement, biological method is considered to be the most effective way which has the advantages such as water-saving, low cost, friendly environmental etc and promising application prospect.But research on the aspect is only at the preliminary stage.Combining reading large number of domestic and foreign relevant literature with years' experimental research in this field,this paper reviewed the research progress on halophyte improvement technology in saline-alkali land, analyzed the mechanism of improving saline-alkali soil with halophyte,discussed the classification and improved way of halophyte,and systemically stated the response of soil micro environment around rhizosphere, plants' growth and nutrient uptake on saline-alkali soil improvement with halophyte. As a result, the biological method is regarded as a promising method for saline-alkali land improvement and has great potential.It proposed the problems existing in improving saline alkali soil with halophyte and look into its application prospect.The result can provide direct reference for the later study on saline alkali soil improving by halophyte.