The standardized value of femur length at 37 weeks of pregnancy is about 7.10±0.52cm, which varies from person to person and may be related to genetic and nutritional factors. Femur length refers to the length of the thigh bone of the fetus, which is one of the indicators to monitor the growth and development of the fetus, and abdominal ultrasound can accurately measure its specific value. As the weeks of pregnancy increase, the value of femur length will gradually increase. Generally speaking, the standard value of femur length at 37 weeks of pregnancy is about 7.10±0.52cm, however, due to the influence of genetic and nutritional factors, the actual femur length of different fetuses may deviate, as long as the deviation is not more than 1~3 weeks, it is relatively normal, and does not need special treatment. However, if the difference between the femur length and the standard value is large, it is necessary to go to the hospital in time for consultation and treatment. It is recommended that pregnant women pay attention to daily care, timely supplementation of nutrition, maintain an optimistic and cheerful attitude, take more rest, avoid overwork, and go to the hospital for regular checkups to prepare for labor.