Coronary artery d1 refers to the first diagonal branch, and 95% stenosis belongs to severe stenosis. Whether it is serious or not mainly depends on the condition of the original blood vessel. If the original blood vessel is thin, the corresponding condition is not serious; if the original blood vessel lumen is thicker, it is a serious condition. 1. The original lumen is thin and does not play a major role in the blood supply to the heart. Even if the stenosis is severe, it does not have a great impact on the blood supply, and most of the problems will not be particularly serious. 2. The original lumen is relatively thick, which plays an important role in blood supply to the heart, and severe stenosis will seriously affect myocardial function, which is a serious condition and requires stenting. Coronary d1 opening 95% stenosis needs to be combined with clinical symptoms to determine the synthesis, the appearance of obvious symptoms of chest pain, we should consult a doctor in a timely manner, under the guidance of the clinician standardized treatment.