Abstract: In order to investigate the physiological mechanisms of ion absorption, accumulation and transportation in pea seedlings under various types of salt stress (NaCl, mixed sodium salts and mixed chlorine salts, the control treatment was Hoagland nutrient solution), the characteristics of absorption and accumulation of ions in three varieties of pea (‘Yinwan NO.1’, ‘S5001-1’ and ‘737’) seedlings were studied using a hydroponic method. Key findings were: 1) Under NaCl and mixed sodium salt stress, Na⁺ contents in shoots and roots were significantly higher than control, whereas contents of K⁺ and Ca²⁺ were significantly lower. Under mixed chlorine salt stress, Na⁺ contents in shoots and roots did not differ significantly from those of control plants. However, contents of Cl^-, K⁺, Ca²⁺ and Mg²⁺ were significantly higher than for the other two salt treatments. 2) Under the control treatment, K⁺ was absorbed and accumulated prior to other ions in three varieties of pea, followed by Ca²⁺. Under NaCl and mixed chlorine salt stress, K⁺ was absorbed and accumulated prior to other ions, followed by Na⁺ and Cl^-. Under mixed sodium salt stress, Na⁺ and K⁺ was absorbed and accumulated prior to other ions, followed by Ca²⁺, while the characteristics of transportation and accumulation of salt ions among three varieties of pea were different under various types of salt stress. 3) Under NaCl and mixed sodium salt stress, the selective absorption coefficients SA_K,Na、SA_Ca,Na and SA_Mg,Na in the three varieties of pea were significantly higher than in control plants, while significantly lower than under mixed chlorine salt. The ST_K,Na and ST_Ca,Na in ‘S5001-1’ seedlings were significantly higher under NaCl and mixed sodium salt stress than in control plants, whereas the ST_K,Na and ST_Ca,Na in ‘Yinwan NO.1’ under mixed sodium salt and mixed chlorine salt treatments were significantly lower than for controls. The ST_K,Na of the three varieties of pea were similar under mixed chlorine salt stress. The study showed that the accumulation of Ca²⁺, K⁺ and Mg²⁺ in shoots under NaCl and mixed sodium salt stress was lower than control, whereas the ability of roots of pea seedlings to absorb and transport Ca²⁺, K⁺ and Mg²⁺ was weakened in response to salt stress. Under mixed chlorine salt stress, the absorption and accumulation of Ca²⁺, K⁺ and Mg²⁺ in shoots was higher than under the other two salt treatments (NaCl and mixed sodium salts), whereas in roots they were significantly lower than under other two salt treatments.