A field experiment was conducted to study the effects of amino acid fermentation tail liquid on water soluble fertilizer under protected tomato cultivation.In the experiment,the common water soluble fertilizer(181026)was assigned to be the control group,and water soluble fertilizers mixed with three amino acid fermentation tail liquid,respectively,were grouped into three treatments as new fertilizers.After protected tomato cultivation,the yield and quality of tomato was determined,so was the soil fertility.The results showed that,compared with common water soluble fertilizer,three treatments which used new fertilizers enhanced the yield and quality of tomato,and improved soil fertility effectively.In detail,the yield increased by an average of 9%;the soluble solids,soluble sugar,Vc and sugar acid ratio of tomato fruit increased by 14.61%~19.28%,10.15%~16.54%,16.32%~17.73% and 35.38%~36.01%,respectively;the content of titratable acidity reduced by 7.84%~16.00%;the total nitrogen content,effective phosphorus content and microbial biomass carbon content of soil increased by 4.32%~6.79%,1.88%~5.73% and 27.77%~36.23%,respectively;the activity of soil invertase,urease and alkaline phosphatase increased by 34.46%~38.39%,10.59%~16.47% and 10.74%~22.15%,respectively.Therefore,the amino acid fermentation liquid has the synergistic effects on common water soluble fertilizer and is worth extensive application.