Abstract: Objective To apply the fetal weight formula in calculation of fetal weight reference value in Jing'an District of Shanghai.Methods According to the new reference tool proposed by Zhang Jun et al for assessment of fetal growth, data were collected from 1,091 full-term children of Jing'an District. And the average birth weight of 294 forty weeks gestation babies of the total was used as the basic data for making reference value. The new reference value obtained by calculation and the actual investigation value by the team were listed and compared with the average fetal weight of each gestational age in 15 cities nation-wide in 1988 and the 10^th and 90^th percentile data.Results The weight data of each gestational age from new reference value conform to those of actual survey data, and are slightly higher than those of the 15-cities. The new reference broken down by sex also conforms to those of actual survey data.Conclusion The fetal-weight calculation formula can be verified and widely used in creation of birth weight reference in various regions.