Abstract: Objective　To explore the diagnostic and therapeutic evaluation of pulmonary ultrasonography in secondary pulmonary hypertension. Method　The changes in pulmonary ultrasonography and pulmonary X-ray in a child with secondary pulmonary hypertension during his diagnosis and treatment were retrospectively analyzed. Results　A 2-day-old boy was admitted to hospital for dyspnea. Chest X-ray showed congenital heart disease (pulmonary hyperemia). Echocardiography indicated pulmonary hypertension, patent ductus arteriosus and patent foramen ovale. Pulmonary ultrasonography showed the manifestations of respiratory distress syndrome such as abnormal pleural line, disappearance of line A, pulmonary consolidation and bronchial inflation. After anti-infection therapy, replacement of pulmonary surfactant and other treatments, pulmonary ultrasonography showed that A-line appeared and consolidation disappeared. And the child was cured and discharged 3 weeks later. Conclusion　Pulmonary ultrasonography has certain guiding significance in the diagnosis and treatment of secondary pulmonary hypertension, and has certain advantages over X-ray.

Key words: pulmonary hypertension;　pulmonary ultrasonography;　X-ray;　neonate