Abstract: 【Objective】 In order to explore the effect of microbial agents on the growth of eggplant seedlings after colonization.【Methods】 Using the variety "black-bright" as test materials and the random block as test method,the different concentrations of Baitai microbial agents（special for seedlings）were selected to carry out the root filling test on eggplant seedlings.【Results】 The results showed that 300 times diluent of Baitai microbial agents（special for seedlings）was applied（treatment 2）on the 3^rd,10^th and 20^th day after root irrigatedion.The plant height of eggplant seedling increased by 13.45%,12.02%,10.56% than CK,stem diameter increased by 11.68%,10.81%,10.00%,leaf area increased by 14.14%,17.09%,10.57%,abover overground fresh weight increased by 26.73%,23.30%,18.43%,root fresh weight increased by 25.40%,39.44%,36.48%,abover overground dry weight increased by 26.83%,23.40%,18.19%,root dry weight increased by 27.27%,41.67%,35.00%,respectively;Root-shoot ratio was higher than that of the control group 13.51% and 16.22% aton the 10^th and 20^th day after root irrigatedion;The contents of chlorophyll a,b and chlorophyll（a+b）were 9.88%,12.90% and 10.71% higher than those of CK;Soluble protein content increased by 8.22%;Treatment 3（100 times diluent）showed the same performance as treatment 2,with no significant difference between them（P>0.05）,bothwhich could promote plant growth and development and improve metabolism level.【Conclusion】 Different concentrations of Baitai microbial agents could promote the growth of eggplant seedlings after transplanteding.Combined with cost input,it is more economical and effective to use 300 times diluent in production.

Key words: Microbial agent, Eggplant, Growth indices