The purpose of the study was to find out the Comparative Analysis of Postural Deformities between School Boys participating and Non-participating in Sports Activities. To achieve the purpose of the study, 300 School boys’ (150 Sports Activities boys and 150 Non-participate Sports Activities boys) students were selected as subjects randomly from Tirunelveli District, Tamilnadu. The age of the subjects were ranged from 8-13 years. The following variables were be chosen to analysis the posture in Side view 3 parts only they are Neck, Chest, Shoulder. The experimental procedure for this study was static group comparison design. The data collected from the two groups on selected variables such as posture were statistically examined for significant differences, if any applying the Descriptive Statistics. There was significant difference on posture between school boys participating and non participating in sports activities. School Boys participating person had good posture compared to nonparticipation in sports activities.