Pitching is a movement, composed with lower extremity, trunk, and upper extremity, that be linked with each segment, and is following in a sequence. Stride leg leads body forward, throwing arm rotating speedily, and then throwing the ball by forward lunge. Purpose: To observe landing ground reaction force during pitching straight ball and rise ball. Methods: Kistler 9281 Force plate (Frequency: 1,000Hz) was used to collect the five female softball windmill pitchers. Results: The delivery period (stride-foot up to off) during throwing straight ball and rise ball were 642±9 and 636±105ms separately; The acceleration period (stride-foot off to ball release) during throwing straight ball and rise ball were 119±7 and 120±6ms separately. The peak forces in vertical direction of ground reaction force during throwing straight ball and rise ball were 3.04 and 3.19BW separately; the peak forces in propulsive (+)/braking (-) direction of ground reaction force during throwing straight ball and rise ball were 1.36 and 1.37BW separately; the peak forces in medial (+)/lateral (-) direction of ground reaction force during throwing straight ball and rise ball were 0.45 and 0.46BW separately. Conclusion: The medial force has greater variation than straight ball. The training of the stride leg cannot be ignored as the both of types of peaks of vertical force are more than bodyweight 3-4 times.