From the perspective of biomechanics,this articleanalyzes thethree stages and four nodes moments forforehand smash technique, focuses on analysis themeasurement methodsof torsorotationmagnitude, the correlation between torso twistangular andhand speed,and the principle ofupper parts’enlargementeffect.Based on thegenerationprinciple discussion of the forehand smash technology, itestablishesthe calculation model of torso rotation angle that is the angle calculation of the shoulder line equation attwo different moments, and then throughthe dataof 10 athletes’torso rotation angular velocity and the hand’sinstantaneous velocity when the racket hits the badminton, obtainsa better linear regression modelusing statistical correlation analysis, andfinallyanalyzesthe speed transfer condition use of various body parts in the smashprocess by using the whipping ation principle.