In order to explore a high-efficient，simple and pollution-free mineral nutrient extraction
method for substrate seedlings，this paper took deionized water as extractant，studied the effects of 3 factors
including solid-liquid ratio （m：m），extraction temperature and oscillation time on 13 kinds of mineral
nutrient extraction efficiency．The results showed that the treatment combination with the highest NO₃^--N and
K extraction efficiency was solid-liquid ratio of 1：20，extraction temperature of 50 ℃，oscillation time of 5
hours，and the treatment combination with the highest extraction efficiency of NH₄⁺-N，P，Ca，Mg，S，Fe，
Mn，Cu，Zn，Na and Cl was solid-liquid ratio of 1：20，extraction temperature of 50 ℃ and oscillation time
of 10 hours．This paper further established TOPSIS model；comprehensively judged the extraction efficiency
of 13 kinds of mineral nutrient；screened out the optimal treatment combination as solid-liquid ratio of 1∶20，
extraction temperature of 50 ℃，and an oscillation time of 10 hours.