©　2017,　Editorial　Board　of　Journal　of　Xi＇an　Jiaotong　University　(Medical　Sciences).　All　right　reserved.　Objective:　To　analyze　the　factors　influencing　the　occurrence　of　macrosomia　so　as　to　provide　a　theoretical　basis　for　the　prevention　of　macrosomia.　Methods:　The　data　were　selected　from　the　findings　of　Survey　on　Prevalence　and　Risk　Factors　for　Birth　Defects　in　Shaanxi　Province.　This　study　intended　to　select　data　of　macrosomia　in　Xianyang　City　and　its　influencing　factors　for　statistical　analysis.　The　rates　were　compared　by　χ2;　the　influencing　factors　were　analyzed　by　univariate　and　multivariate　Logistic　regression.　Results:　The　incidence　of　fetal　macrosomia　among　single　live　birth　neonates　in　Xianyang　was　5.2%.　The　incidence　of　macrosomia　was　6.5%　in　males　and　4.2%　in　females,　with　a　significant　difference　(P＜0.001).　From　2010　to　2013　the　annual　incidence　rate　of　macrosomia　was　5.4%,　6.2%,　5.9%　and　4.4%,　with　no　significant　difference　(P=0.151).　The　incidence　rate　of　macrosomia　in　urban　and　rural　areas　was　6.3%　and　5.5%,　respectively,　without　significant　difference　(P=0.556).　The　incidence　of　macrosomia　was　3.2%　in　Binxian　County,　5.6%　in　Changwu　County,　6.7%　in　Liquan　County,　5.4%　in　Qianxian　County,　8.0%　in　Wugong　County,　and　4.2%　in　Xunyi　County,　with　significant　differences　(P＜0.001).　Logistic　regression　analysis　showed　that　the　occurrence　of　macrosomia　was　related　to　the　baby＇s　sex,　mother＇s　age,　the　times　of　pregancy,　the　time　of　antenatal　care,　alcohol　intake　during　pregnancy　and　father＇s　occupation.　Conclusion:　The　incidence　of　macrosomia　of　Xianyang　from　2010　to　2013　was　close　to　the　national　average.　The　sex　of　baby,　mother＇s　age,　the　times　of　pregnancy,　the　times　of　antenatal　care,　drinking　history　during　pregnancy　and　father＇s　occupation　may　affect　the　occurrence　of　macrosomia.