ps),prenatal ultrasound measurement of fetal biparietal diameter,Рhead circumference, abdomen circumference and femur length,single, double andРmultiple pound respectively estimation fetal weight, but there are many the size differences between westerner and Oriental, using westerner formulas to estimate china fetal weight , there have significant error. Although our country have scholars already established some new formula with using china fetal data, but the accuracy and feasibility of the formula need further improvement and validation, so that this study applies china fetal data establish our domestic estimated fetal weight formula, in order to reduce error and improve the accuracy of estimated fetal weight.РIn the context,we make a research on part of the Natinal Key Technology R&DР6
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