Pot culture were conducted to investigate K⁺,Na⁺,biomass and water content changes of different sections of beach plum(Prunus maritima Marshall) cutting seedlings,which were irrigated with NaCl solutions of 0.15%,0.29%,0.58%,0.88%,1.17% and 1.46% mass concentration.The result showed that:(1)80 days after the irrigation,with the stress increasing the Na⁺ content in roots,stems and leaves increased,while K⁺ content in roots and stems and K⁺/Na⁺ decreased.The K⁺ content in leaves was much higher than that in other organs,which remained steady during the experiment.(2)With the increasing salt stress level/time,the leaf,shoot and root dry weight showed their descending following their ascending,and an apparent consumption of dry weight was derived from the 0.88%-1.46% NaCl irrigation.(3)Water content in shoots and leaves was significantly reduced due to the continuous salt stress,but root activity and water content evaluated in an opposite direction,that shows the beach plum builds up a salt-dilution and Na⁺ storage method by accelerating its root succulence.In addition,more Na⁺ accumulates in leaves under a harsher salty condition.