The original Bacillus subtilis was isolated from the soil of an apple orchard,and B. subtilis strain BS80-6,selected from Bacillus subtilis by ion implantation,was used as an antagonist for postharvest biological control against apple anthracnose( colletotrichum gloeosporioides). The mechanisms of action and efficacy of Bacillus subtilis strain BS80-6 against apple anthracnose caused by colletotrichum gloeosporioides were studied in vitro and on apples in controlled and semi-commercial conditions. An application of cell suspension( 108 cells per mL) of the antagonist in artificial wounds of apples reduced growth of C. gloeosporioides after storage at different temperatures. The inhibitory actions of cell culture to hyphal growth and to spores germination were 86. 6% and 98. 65%,respectively,and the control efficacy of cell culture against the disease was 60. 34% at room temperature. The results showed that BS80-6 was more effective against apple anthracnose.The cell culture of BS80-6 received better control efficacy against apple anthracnose than culture filtrates and autoclaved cell. All treatments significantly inhibited the disease both in vitro and in vivo compared with control. Fruits treated with cell culture and stored at 10 ℃ had lower infection rate,more delayed formation of acervwlus and smaller lesion diameter than those stored at 20 ℃. There was better control efficacy in fruits inoculated with spores after application of BS80-6. The mechanisms of BS80-6 activity appeared to involve production of an antifungal substance,deformation of hyphal cell and disintegration of cell wall. Besides,BS80-6 could improve the activity of major defense enzymes of apple,such as peroxidase( POD) and polyphenol oxidase( PPO). The original Bacillus subtilis was isolated from the soil of an apple orchard, and B. subtilis strain BS80-6, selected from Bacillus subtilis by ion implantation, was used as an antagonist for postharvest biological control against apple anthracnose (colletotrichum gloeosporioides). The mechanisms of action and efficacy of Bacillus subtilis strain BS80-6 against apple anthracnose caused by colletotrichum gloeosporioides were studied in vitro and on apples in controlled and semi-commercial conditions. An application of cell suspension (108 cells per mL) of the antagonist in artificial wounds of inhibitory growth of C. gloeosporioides after storage at different temperatures. The inhibitory actions of cell culture to hyphal growth and to spores germination were 86. 6% and 98. 65%, respectively, and the control efficacy of cell culture against the disease was 60. 34% at room temperature. The results showed that BS80-6 was more effective against apple anthracnose. The cell culture of BS80-6 r All treatments significantly inhibited the disease both in vitro and in vivo compared with control. Fruits treated with cell culture and stored at 10 ° C had lower infection rate, more delayed formation of acervwlus There was better control efficacy in fruits inoculated with spores after application of BS80-6. The mechanisms of BS80-6 activity were to involve production of an antifungal substance, deformation of hyphal cell and disintegration of cell wall. Besides, BS80-6 could improve the activity of major defense enzymes of apple, such as peroxidase (POD) and polyphenol oxidase (PPO).