针对混凝土材料断裂的特点，探讨了影响断裂韧度的主要因素：尺寸效应、混凝土强度和相对缝深等。在分析１１根三点弯曲匦切口梁试验资料的基础上，结合混凝土结构强度理论，提出了混凝土断裂韧度实用计算公式。该公式可以很容易地通过人们熟知的构件尺寸和混凝土强度推算出断裂韧度，这对工程设计是有益的。 According to the fracture characteristics of concrete materials, the main factors affecting the fracture toughness are discussed: size effect, concrete strength and relative depth of seam. On the basis of analyzing the test data of 11 three-point bending concrete beam, combined with the strength theory of concrete structure, a practical calculation formula of the fracture toughness of concrete is proposed. This formula can easily calculate the fracture toughness through well-known component sizes and concrete strength, which is beneficial to engineering design.