Pregnant women with a heart rate of 110 to 120 beats / min if there are no obvious symptoms, generally no special risk, if pregnancy or pre-pregnancy cardiac or hyperthyroidism and other underlying diseases, to be targeted treatment to avoid greater risk. 1. Pregnant women with no previous underlying diseases whose heart rate fluctuates from 110 to 120 beats / min, simple sinus tachycardia, generally due to the increased burden on the mother’s heart after pregnancy, if there is no dizziness and other special symptoms, rest, or oxygen can be relieved in general. 2. Previous congenital heart disease or anemia or hyperthyroidism and other underlying diseases, if the heart rate is accelerated, we should further carry out relevant examinations to control the primary disease, try to avoid the primary disease induced heart disease in pregnant women, resulting in adverse consequences.