Calcifications in the placenta have been considered as a sign of the maturity because it is found freequently in variable degree in full-term placentas. The placentas studied were those form deliveries at Chung -ang University Hospital during the period of January 1978 to June 1980 and were excluded if their deliveries were by Caesarean section. Roentgenographic studied of placentra were performed postnatally in 135 cases delivered form normal pregnants. The results were as follows : 1. The incidence of calcification in the placenta was 53.3%. 2. The tendency of placental calcification was increased as progress of maturity but not indicated as postmaturity. 3. Calcifications were less correlated with increasing gravidity of maternal age. 4. Calcifications occured more frequently with increasing birth weight.5. Calcifications in placentas were more frequently in the neonates with 10 scores of Apagar and normal level of maternal hemoglobin. 6. No significant correlation between ncidence of calcification and maternal toxemial was observed. In the pregnants with an episode of previous abortion or S.P.R.M., incidence of calcification was appparently increased but statistically not significant. On the whole, placental calcifications are not harmful and identified as normal or proper aging precess.