Abstract: In order to solve the inaccurate calculation problem of damage range from tunnel blasting, a calculation method of tunnel surrounding rock damage range under single-hole blasting is proposed based on the D-P criterion and fracture mechanics principle. Based on the relevant project, the damage range of tunnel surrounding rock is calculated under the action of single-hole blasting. The results show that the calculated radius of the crushing zone is 242 mm, which is within the range of measured values; the radius of Fissure Zone Ⅰ is slightly larger than that of the crushing zone, and the radius of Fissure Zone Ⅱ is 1 473 mm, slightly larger than the range of measured values.The calculated results are close to the results of the finite element simulation; The crushing zone of surrounding rock under the action of single-hole blasting is formed at 130 μs, Fissure Zone Ⅰ formed at 220 μs, and the fissure within the Fissure Zone Ⅰ expands at 220-820 μs, so as to form Fissure Zone Ⅱ at 820 μs; The attenuation rates of the vibration velocity in X and Y directions within Fissure Zone Ⅱ and the crushing zone increase with the growth of the distance to the blasting center, respectively; Under the action of single-hole blasting, the main control factors for the radii of the crushing zone and Fissure Zone Ⅰ and the radius of Fissure Zone Ⅱ are the explosive blasting velocity D and Poisson's ratio μ, respectively.