Chest compressions precautions are as follows: 1, judging that the patient’s respiratory and cardiac arrest, it is necessary to press the patient in the shortest possible time, which will reduce the interruption of blood flow to the vital organs and allow the stopped heart to beat in time; 2, the compression site should be in the middle and lower 1/3 of the sternum, but also press hard, the depth of compression should be 5-6cm, so that the thorax is fully rebounded; 3, the compression frequency is 100-120 times, if someone can replace, let people rotate every 2 minutes for compressions to ensure the quality of compressions; 4, minimize the interruption of compressions, because high-quality compressions are the key measures of cardiopulmonary resuscitation.