【Objective】 To study the association between breast development age of idiopathic central precocious puberty(ICPP) girl and maternal age at menarche and maternal Height. 【Methods】 1) ICPP group included 43 cases and SPT group included 41 cases and 30 cases as control group. 2)Compared the maternal age at menarche and height among ICPP,SPT and control groups. 3)Linear correlation analysis was made between the age of breast development and maternal age at menarche and height in ICPP girls. 【Results】 1)Maternal age at menarche in ICPP group were significantly lower than SPT group[(11.66±1.35)ears vs (12.93±1.66)ears, P<0.01] and than control group[( 11.66±1.35)ears vs (14.03±0.58)ears,P<0.01).There was no significantly difference of them between SPT and control group(P>0.05). 2)The maternal height in ICPP group was significantly lower than both SPT and control group[(154.13±3.61)cm vs (159.80±4.71)cm, (154.13±3.61)cm vs (159.5±2.33)cm P<0.01 respectively]. 3)There were significanly linear correlation between the age at breast development and maternal age at menarche and height in ICPP(P<0.01, respectively). 【Conclusions】 1)Breast development age of idiopathic central precocious puberty(ICPP) girl has a large correlation with maternal age at menarche and maternal height. 2)Short stature of ICCP girl and mother may have correlation with their early puberty or ICPP.