On-site CPR needs to pay attention to: 1, pay attention to environmental safety, to ensure that the rescuer and the rescued is in a safe environment; 2, cardiac resuscitation and artificial respiration to synchronize, only compressions on the heart, not artificial respiration, it is unlikely to be good; 3, the ratio of 30:2 is more appropriate; 4, compression sites in the midpoint of the line between the two nipples; 5, the depth of compressions to meet the requirements, do not reach the depth of compressions, the negative pressure of the heart did not reach the degree of Blood circulation is not established; 6, artificial respiration to wrap the patient’s mouth, pinch the nose, head back, to keep the airway open, the gas can blow in, after blowing, the patient’s chest lifted, so as to ensure effective; 7, call for help or call 120, to seek help from others, to create better conditions for follow-up treatment.