The potted camphor seedlings of two years were taken as the materials and were treated by the mixed solution of salinity-alkalinity (Na₂CO₃︰NaHCO₃ = 1︰1) with different concentrations (0, 50, 100 and 200 mmol/L ), the enzyme activities and pH of rhizosphere soils were studied. The results showed that pH value of rhizosphere soil increased with the stress time and concentration of salinity-alkalinity; Urease activity of 0 mmol/L treatment showed an increasing trend, but those of salinity-alkalinity stress increased first and then degreased. Urease activity increased with the increase of salinity-alkalinity concentration. Catalase activity showed an increasing trend, and it also increased with the increase of salinity-alkalinity concentration. Invertase activity increased first and then decreased, and it decreased with the increase of salinity-alkalinity concentration. Alkaline phosphatase activity was promoted under slight salinity-alkalinity stress (0—50 mmol/L) but restrained under severe salinity-alkalinity stress (50—200 mmol/L). Proteinase activity of 0 mmol/L treatment showed an increasing trend, but inhibited under salinity-alkalinity stress. The conversion of available nutrients in soil and nutrient absorption by plants are influenced by salinity-alkalinity stress.