Abstract: In this experiment of Pepper Plug-seedling, the compound fermentation broth of Actionomycetes, PSB (Photosynthetic Bacteria) and Yeast agent, which diluted to different concentrations, was used as sowing bottom water, to study the effect of the compound fermentation broth to physiological and morphological index, dry materials of seedling stage. The result showed that the compound fermentation broth diluted 50 times obviously promoted growth, increased the fresh＆dry biomass of aboveground and underground, improved the soluble carbohydrase content and the root activity of pepper seedlings. However, the effects of fermentation broth diluted 150 times to physiological and morphological index, fresh＆dry biomass of seedlings were not obviously.