The gene STK1 of setosphaeria turcica is extremely high in resistance to sodium salt in a yeast body. The sodium salt is a main salt stress factor of a plant, so that the salt resistance of the gene STK1 in a model plant arabidopsis is researched. A transgenetic strain containing the gene STK1 is obtained through conversion; analysis on the salt resistance shows that the seed germination rate of the transgenetic strain is greater than that of a wild strain, and the root of the transgenetic strain is longer than that of the wild strain; the influence on seedling is less than the influence on the wild strain; due to the gene STK1, the salt resistance of the plant is improved; after salt treatment is executed, content of osmotic adjustment substances such as free praline, soluble sugar and ABA in the transgenetic strain, and the expression quantities of relevant salt resistance genes DR29A and DREB2A are greater than those of the wild strain; the biochemical and molecular research shows that the salt resistance of the plant is improved by the gene STK1; the salt resistance function of the gene STK1 in the arabidopsis lays theoretical and practical production foundations for cultivation of a new variety of transgenetic plants.