ＰＤＡ是高原地区常见的先天性心脏病之一，居首位。本文通过对３７例儿童ＰＤＡｘ线分析，认为高原地区与平原地区ＰＤＡＸ线征象基本一致，不同的是因高原缺氧易早出现肺动脉高压，因而肺动段的凸出，右下肺动脉的增宽及右心房室的增大较平原明显，肺血管纹理增多增粗且较紊乱，易与房或和空间而缺损或其它心内系统的复合畸形相混淆，给诊断和鉴别诊断带来困难，因此早期正确诊断和及时手术治疗实属重要。 PDA is one of the common congenital heart disease in the plateau, ranking the first place. In this paper, 37 children with PDAx line analysis, that plateau and plain PDX line signs are basically the same, the difference is due to early hypoxia high altitude pulmonary embolism, and thus pulmonary segment bulge, lower right pulmonary artery widening and Right atrial enlargement is more obvious than plain, pulmonary vascular texture increased thicker and more chaotic, and room and space and easy to defect or other cardiac deformity complex confusion, to the diagnosis and differential diagnosis difficult, so early Correct diagnosis and timely surgical treatment is important.