The effects of the application of vermicompost mixed with two different functional probiotics Bacillus amyloliquefaciens X and Fluorescent pseudomonas Y to the growth and quality of watermelon were studied on the same nutrient level.The results showed that whether or not mixed with probiotics,compared with chemical fertilizer and conventional compost,vermicompost reduced the incidence of watermelon plants fusarium wilt,improved the watermelon growth,yield and increased the content of soluble solids,soluble sugar,Vc significantly.The Vc content of watermelon with the application of vermicompost was 159% higher than that of conventional compost.The application of probiotics improved the growth and quality of watermelon in different degrees,especially with the cooperation of vermicompost.In vermicompost treatment,the watermelon yield and soluble sugar content of applied vermicopost mixed with probiotics were 17.3% and 15.2% higher than those of application of vermicopost only.Variance analysis showed that there were significant interactions between organic compost and probiotics on the watermelon main vine length,longitudinal diameter,yield,soluble solids and soluble sugar content.These results indicated that the vermicompost mixed with probiotics had significant effect on the improvement of watermelon growth,which could lead to the less applications of chemical fertilizers for watermelon green production.