Determination of sex is an integral first step in the development of the biological profile in human osteology The general anatomical regions used for sex determination are the pelvic girdle, skull and long bones, although other bones have also been utilized [1]. The developmental age changes are different in male and female bones including sacrum [2]. The pelvic girdle is the most accurate area to determine sex and methods using the pelvic girdle tend to make successful predictions in 90 to 95 percent of individuals [3]. In our study 100 sacra of both sexes were compared for of Body of First Sacral Vertebra (S1), sacral index , curvature index and auricular index. The results show Index of Body of First Sacral Vertebra (S1) in male is 62.53 and in females it is 54.74. Sacral Index in male is 97.45 and in females it is 101.49. One way ANOVA shows 0.001 significance suggesting statistically highly significant difference in male and female for both sacral index and Index of Body of First Sacral Vertebra (S1). Curvature Index in male is 100.57 and in females it is 99.33. One way ANOVA shows f value as 3.650 which was statistically significant. Auricular index in male is 51.34 and in female it is 50.11.one way ANOVA shows f value as 1.037 which was not significant statistically. The results show that Index of Body of First Sacral Vertebra (S1), Sacral index and curvature Index are more reliable parameters than auricular index for sexual diamorphism assessment.