Abstract: The study aims to investigate the embryo-fetus development toxicity of the novel PPAR-δ agonist HS060098 on SD rats. The pregnant rats that were randomly divided into the solvent control group(1% hydroxypropyl methyl cellulose water solution)and HS060098 suspension groups(10, 30 and 100 mg·kg^-1·d^-1)were orally administered with HS060098 suspension or vehicle during the gestation of 6-15 days(GD6-15). At termination(GD20), female rats were sacrificed. The pregnant females were evaluated by corpora lutea count, implantation sites, existence and death of embryos. Fetal sex, weight, externals, variations and malformations of viscus and skeleton were observed. The results show that there were no significant abnormality in maternal general conditions and fetal appearance as well as viscera, but in the 100 mg·kg^-1·d^-1 group, the maternal weight gain decreased greatly(P < 0.01)and the skeletal ossification delayed remarkably(P < 0.01); in the 30 mg·kg^-1·d^-1 group, the fatal and litter number of incompletely ossified sternebrae Ⅱ was higher than those of the control group(P < 0.05); the skeletal malformations occurred in all dose groups, which indicate that the novel PPAR-δ agonist HS060098 had maternal toxicity and adversely effected fetal skeletal development under the experimental conditions.