从中长跑训练中的负荷量、负荷难度和负荷密度给运动员施加的困难程度入手 ,结合训练实践 ,对负荷难度的确定、计算和运用进行了说明 ,从而得出了比较科学的理论依据 ,对运动负荷搭配形式给出了相应的系数 ,量化了训练负荷 ,确定了量难度、强度难度和密度难度的计算方法 ,明确训练负荷的特点 ,寻找训练的动态作用点 ,增加新刺激的含量 ,提高训练的积累效果和运动水平 ,为教师提供训练的技术理论和方法 Starting from the difficulty that the load, the load and the load density exert on the athletes in middle-long-distance running training, this paper describes the determination, calculation and application of the load difficulty by combining with the practice of training, which leads to the scientific and theoretical basis, The corresponding coefficients are given by load combination, the training load is quantified, the calculation method of volume difficulty, intensity difficulty and density difficulty is determined, the characteristics of training load are clarified, the dynamic action point of training is found, the content of new stimulation is increased, training is increased The accumulation of effects and sports level, to provide teachers with training in technical theory and methods