This study investigated the developmental trends of self concept characteristics of Chinese children and adolescents. 1033 male students and 1059 female students (included 1-9 graders) from two elementary schools and two junior high schools were selected as subjects The self concept Scale (followed the Tennessee Self Concept Scale) was administered to the subjects in the regular class settings. This study treated the scale scores of self concept scale as criteria, and grade levels as predictors The trend analysis showed that: (1) the mean scale scores of self concept scale are high, which indicated the self concept characteristics of Chinese children and adolescents are sound and positive, (2) the straight regression lines (descending line form) is a good fit to the scale scores of self concept scale predicated by the grade levels, and the nonlinear regression lines are not good ones.