The salt content in soil is increased gradually from southeast to northwest in China, Pinus sylvestris var. mongolica is adopted in the soil of pH≈7. Except the harsh climate conditions in northwest arid area, the high salt content and pH value in soil limited local seedling nursery and its forest growth seriously in desert area. The experimental research shows that the two-year old seedlings are sensitive to the soil salt, it is not only influenced the seedling survive, but also influenced its growth and development. The soil salt content for two-year old transplanting seedlings can not be more than 0.5% and 0.4% for seed sowing nursery. In salt ions factors for surviving ratio of transplanting seedlings, HCO3- is the main factor, seconds are SO42- and Mg2+、Ca2+、 K++Na+、Cl-. With the age increasing, the salt resistance is increasing gradually, however, the influence of the forest growth is obviously.
