In this study, the roots of capscium with good growth were collected from the field where they have been planted for many years. After surface disinfection, an endophytic bacterium PEB40 was isolated from the roots. This strain can produce siderophore to form larger iron phagocytic circles on chrome azurol S (CAS) plates and also has the ability to produce indole-3-acetic acid (IAA) and dissolve organic phosphorus, showing good plant growth potential. The pot experiment showed that the PEB40 strain had significant growth-promoting effect on capscium, and the yield, plant height and spread of capscium after applying the endophytic bacterium PEB40, and it had significant advantages compared with the blank group (P<0.05). The height increased by 18.9%, the spread increased by 20.7%, and the yield increased by 35.3%, indicating that the endophyte PEB40 has a significant growth promoting effect on capscium. According to the 16S rDNA sequence, phylogenetic tree and morphological characteristics, the PEB40 has a high possibility of being a new species of genus Pseudomonas. This study demonstrated that the CAS plate could be used for high throughput screen of bacteria with plant growth promotion potential, and the PEB40 shows a great potential for developing to microbial fertilizer.