The salinization phenomenon of farmland soil is becoming more and more serious in the saline-alkali area of Dengmayinghu Lake in Wuwei city， Gansu province. The aim of this study was to screen suitable amendments to alleviate the soil salinization of farmland in this area， and provide theoretical support for related research. 5 treatments were set up:no modifier(CK)， phosphogypsum( TP)， sulfur( TS)， Yandibao( TY) and humic acid organic fertilizer( TF). The effects of different improvement measures on water-soluble ions in farmland soil in the saline-alkali area of Dengmayinghu Lake was studied. The results showed:( 1)Adding modifier reduced the contents of water soluble ions in soil and the effects for adding TP， TY were most significant. At 0 ～ 40 cm soil layer， the contents of K+，Na+，Ca2+，Mg2+ significantly decreased by 54.18% and 37.90%， 41.74% and 53.66%， 45.77% and 56.51%， 46.97% and 39.32% when adding TP and TY， and the contents of HCO3 -，Cl-，SO42- significantly decreased by 53.40%， 21.13% and 52.13% with the treatment of TY，respectively， compared with CK.(2)Adding modifier reduced soil pH and the effect for adding TS，TY，TF were most significant. At 0 ～ 40 cm soil layer， the improvement effect of application TS， TY and TF on soil pH were the best， compared with CK， soil pH significantly decreased by 2.53%， 2.71% and 2.67%，respectively.( 3)The improvement effects of adding TY and TF on soil total alkalinity were the best， and TY and TF was the best for total salt content. The best treatments for the whole improvement were TY and TF， the next was TP， but TS was less effective.