The research aimed to study the mechanical skills Osoto gari and Uche Mata for knowledge values angular change for the free leg effective to developing specific exercises for that skills and to get to know the extent of the smile in the biomechanical parameters between each of the specific exercises and skills Osoto gari and Uche Mata in judo , The researcher used the descriptive method using kinetic analysis on a sample one the players of the Egyptian national team judo, The researcher concluded that for knowledge values angular change for the free leg effective to skills Osoto gari and Uche Mata in judo and specific exercises for that skills , the exercises number (6) is the most similar to skill Osoto gari , while the exercises number (2) is the less similar to that skill , the exercises number (5) is the most similar to skill Osoto gari , while the exercises number (7) is the less similar to that skill.