In this experiment,different concentrations（0,30,60,90,120,150,180,210 mmol/L） of NaCl were used to treat the blueberry cv.’Northland’ seedlings,in order to get dynamic variation of growth morphology and physiological and biochemical indexes of blueberry at different days（0,10,20,30,40,50 d）.The results showed that the half-high bush blueberry seedlings ’Northland’ had certain salt tolerance,the low concentration of NaCl could promote the growth of blueberry seedlings,and the salt-tolerance could be improved in the environment of 60 mmol/L NaCl for a long time.The plant height and crown width of blueberry seedlings decreased with the increase of NaCI treatment,and the 50 d were the lowest.In the later stage of treatment;the chlorophyll content of blueberry seedlings decreased with the increase of NaCl concentration.The soluble sugar content of the blueberry seedlings treated with 180 mmol/L NaCl was the highest at the 30th day of the test,and the Pro content reached the maximum at the 20th day of the test.The critical time for the salt-tolerant treatment of the blueberry seedlings was 20～30 d;The effects of NaCl treatment on the POD activity and MDA content of blueberry seedlings were different at different periods,and the difference was obvious with the increase of test time.