Data on female reproductive traits can be crucial to understanding the evolutionary causes of sexual size dimorphism(SSD)of lizards. Here we quantified SSD and female reproductive traits to identify potential associations between SSD and female reproduction in Scincella modesta. We collected 43(17 ♀ ♀,26 ♂ ♂)S. modesta in this study,the largest male and female were 47.4 mm and 46.6 mm in snout-vent length(SVL),respectively. Adults are sexually dimorphic in head length and abdomen length but not in body size or head width,with males were larger in head length,whereas females were larger in abdomen length. Females produced single clutch of eggs during the breeding season. Clutch size and clutch mass were positively correlated with maternal SVL and abdomen length,whereas egg size was not positively correlated with maternal SVL. The coefficient variation of clutch size and clutch mass was 0.20 and 0.12,respectively. When holding female SVL constant using a partial correlation analysis,egg length was negatively related to clutch size,egg width was independent with clutch size. These results suggest that S.modesta is a species with sexually monomorphic SSD,sexual selection and fecundity selection,in which males have larger head length for higher mating success and females have larger abdomen length due to their higher capacity for laying eggs.