Beauveria bassiana was one of the most widely studied insect pathogenic fungi in the world, and it playedan important role in the biological control of pests. However, recent research showed that B. bassiana could occur asendophytes by colonization naturally or inoculation artificially. Endophytic B. bassiana could not only improve thepests and diseases resistance of the host plants, but also promote their growth, which showed B. bassiana was a dualbiocontrol microbe with growth promoting activity on host plants. This paper summarized the progress of endophyticcolonization of B. bassiana and its application in plant protection. In addition, the problems and prospects about en-dophytic B. bassiana on biological control of plant diseases and pests were discussed.