Abstract: Based on the physiological mechanism of strength training of junior athletes,this paper firstly clarifies the some cognitive errors that has been around the junior athlete's strength training,and studies the athlete's strength training effect and method,the hot issues in practical training and training development trend.At the level of physiological mechanism,because the junior athlete's physical development is not yet mature,the level of hormone synthesis is low,muscle fiber hypertrophy in its efforts to enhance the contribution is smaller,so improvement of power during the period is to improve the innervation ability.In training practice,it is recommended to choose the combination of plyometric and speed strength training cycle model.Among them,strength training load intensity is key indicators of training program:by not less than 50%1 RM the load intensity of stimulation,in order to achieve the lowest stimulation threshold of junior athletes and reach the goal of improving their strength.In this paper,the hot issues of strength training to the growth and development of junior athletes,sports injury problems and strength maintain and loss are also discussed.At last,this paper discusses the development trend of the youth strength training in theory,method and load characteristics.