Abstract:Streptomyces widely exist in nature with various functions. Their basal hyphae are multi-nucleated with septa, and spore chains are attached to aerial hyphae. The life cycle is completed from spore germination to spore release. Streptomyces are able to colonize the roots, stems, leaves and other parts of plants. They secrete various metabolites which play important roles in plant growth promotion and biological control. The functions of Streptomyces mainly focused on the enhancement of plant nutrient uptake, promotion of plant growth, and increase of the ability of plants coping with biotic and abiotic stresses were reviewed. The future research directions and application were also prospected.