Pregnant women in premature rupture of membranes, cervical cerclage often need hip-height position to elevate the buttocks, commonly used pillow method, elevate the end of the bed method. 1. Pillow method: put two wide pillows on the waist and buttocks of pregnant women to elevate the buttocks, which can form a slope in the waist and support the waist. 2. Raise the end of the bed method: bricks or other hard objects of the same height placed in the end of the bed under the two legs, raise the end of the bed, pregnant women lying flat on the bed, hips and lower limbs with the end of the bed raised, more than the hips under the pillow to increase comfort. Buttock elevation bed is a common position in obstetrics, mainly used for premature rupture of membranes, cervical insufficiency and other patients in the treatment of fetal preservation, fetal preservation process, if there is any discomfort, you can consult the obstetrician in time, has achieved the best effect of fetal preservation.