Abstract: Effects of mixture liquid of Mn²⁺ and Mo⁶⁺ on the salt tolerance  of cotton seedling were studied.The results showed that the suitable concentration of Mn²⁺and Mo⁶⁺ could improve some characteristics of the seedling such as the length of seedling,the content of lamina chlorophyll,activity of the root system and activity of POD.That is to say the salt tolerance of cotton seeding-growth was strengthened.Among all the treatments,the combination of 1　000 mg·L-1 Mn²⁺ and 200 mg·L^-1 Mo⁶⁺  could achieve the best effect.

Key words: Mn²⁺；Mo⁶⁺；cotton, seedling growth；salt tolerance