The primary purpose of this study was to examine the relationship among Judo awareness and constraints to participation. The study was based on a sample of 412 middle and high school students who lived in the southern Gyonggi province. An on-site questionnaire was developed to ascertain the relationship and it consisted of three sections designed to measure: (a) Judo awareness, (b) constraints to participation, (c) demographic information. Four Stages of data analysis of this study were conducted: (1) description of the sample, (2) exploratory factor analysis with reliability coefficients, (3) ANOVA, and (4) Regression analysis by SPSS 18.0. The results showed that six-factor structures(physical, cognitive, general, justice, technical, dynamic) for Judo awareness and five-factor structures(environmental, physical, control, structural, interpersonal) for constraints to participation were produced. There are statistically positive relationships between ‘physical’ awareness and ‘environmental’, ‘physical’, and ‘control’ constraints and between ‘cognitive’ awareness and ‘structural’ and ‘interpersonal’ constraints. However, the findings provid statistically negative relationships between Judo awareness and constraints to participation such as relations of ‘physical’ awareness to ‘structural’ and ‘interpersonal’ constraints, ‘cognitive’ awareness to environmental’, ‘physical’, and ‘control’ constraints, and ‘general’ awareness to ‘environmental’, physical’, and ‘control’ constraints, ‘technical’ awareness to ‘control’ constraints, and ‘dynamic’ awareness to five all constraints factors.