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Objective: Through video analysis, TGMD-3 and BTS three-dimensional infrared motion capture test, explore the development characteristics of 3~6 years old children's throwing action' scientifically guide children's throwing activities, and promote the development of children's movements. Methods: The independent sample T test was used to compare the differences between boys and girls; the one-way ANOVA was used to compare the differences among different age groups; the two-way analysis of variance was used to compare the differences between different ages and stages. Results: (1) The scores of children at different ages and stages were very significant (P<0.001), and the difference between boy and girl Was not significant (P>0.05), and the boys was slightly higher than girls. (3)3~6 years old children showed significant phase main effect (P<0.05) in shoulder flexion, shoulder internal rotation, elbow flexion, wrist flexion, pelvic tilt, upper body rotation, and pelvic rotation. There was not significant at the age effect. Conclusion: (1) The 3-6 year old children's throwing action did not increase linearly with age, and age was not the only benchmark. (2) The 3-year-old group is mainly distributed in the first two stages, and should focus on guiding the arms backwards and legs to move forward; The 4-year-old group is mainly distributed in the first three stages, and The focus of the guiding its footsteps and layering turning; the 5-year-old group is mainly distributed in the second, third an(i fourth stages, and should focus on guiding its stratified body and systemic coordination. (3) The second stage is the bottleneck in the development of preschool children's throwing action, and it is necessary to guide its breakthrough. (4) The characteristics of the 3~6-year-old children's throwing action were: The first stage relies on the elbow and the wrist to brake. The second stage leans forward on the upper. The third stage leans forward and tilts. Force; The fourth stage relies on the force generated by the body forward. The fifth stage is the systemic coordination. The common feature is that the elbow joints are not completely extended. [ABSTRACT FROM AUTHOR]