The activity of Beauveryia bassian Bb051230 to larvae, pupae and adult of Bactrocera correcta (Bezzi) has been assayed in laboratory.The results show that when the concentration of conidia is 4.0 × 108 spores· mL-1, LT50 of adult reached to (4.53±0.31) d, the mortality rate is (89.66±5.34) % and LC50 is (2.687 2±0.325 8)×105 spores, mL-1; LT50 of larvae reached to (4.66±0.59) d, the mortality rate is (91.83±4.02)% and LC50 is (2.329 7±0.418 5) × 105 spores · mL-1 ; LT50 of pupae reached to (4.89± 0.44) d, the mortality rate is (83.79±2.27) % and LC50 was (2.829 1±0.156 3) × 105 spores · mL-1.