The invention provides a high-efficiency identification method for
salt resistance of cotton germplasms. By utilizing a flower pot soil
seedling cultivation method, cotton seedings are cultivated to a three-leaf-and-one-leaflet stage. The materials with normal and consistent growth vigour are selected and subjected to salt stress treatment and clear
water treatment with the same volume respectively. The second true leaves are selected, the PSII maximum photochemical efficiencies of the true leaves with different treatments are measured respectively, the relative values are calculated, and brought into the standard equation of salt resistant indexes: D=1.943X-0.882 to calculate the salt resistant indexes and determine the
salt resistance, wherein X is for a relative value of a PSII maximum photochemical efficiency and D is for a salt resistant index. The larger the salt resistant index, the stronger the
salt resistance. When the method is compared to the prior art, the results of the obtained standard equation of the method are accurate and credible. The measurement method of PSII maximum photochemical efficiencies is simple and fast, can be performed
in vivo, does not harm plants, and can ensure normal running of downstream experiments. The measurement time is the cotton
seedling stage, so the identification time can be shortened effectively, the efficiency is raised, and the method is suitable for large scale
germplasm resource identification.