Pupose: To use the many-facet Rasch model to assess the developmental level standing long jump checklist. The classical motor style, height and lenght of the standing long jump based on the takeoff component. The checklist was used in one component which was takeoff, and it needed to observe the leg and arm action of standing long jump. Methods: The subjects were 36 students who were from the 1st grade to 3rd grade of an elementary school. The observation method and the many-facet Rasch model were used to analyze the data, screen poor items, reliability, disordered quesitons, and to establish interval rating scale. Results: The use of the many-facet Rasch mdoel to analyze the developmental level standing long jump had the reliablility, item-fit, and single dimension to close the effective estimation. Conclusion: The developmetnal level standing long jump checklist had the reliability and validity to check the motor skills of children.