34 year old male patient with severe acute respiratory failure was admitted to ICU. The patient was hospitalised with progressively worsened fever, coughing and dyspnoea lasting for one week. Severe pneumonia was first considered and antibiotics were started (levofloxacin, vancomycin) empirically and O2 was given through nasal canula. The clinic progressed to severe dyspnea in hours and after short Non-invasive ventilatory (NIV) support patient was entubated and accepted to ICU with severe ARDS. Oseltamavir 75 mg × 2 and Puls streoid therapy (1 mg/day) was added to antibiotics and patient mechanically ventilated. With no reply to the therapy the patient was scheduled to ECMO therapy and transferred to different ICU center where the same medical therapy continued under ECMO support. After a few weeks therapy patient clinics improved. The second case was 33 female patient with same clinic. After symptoms of fever, coughing for a week she was accepted to our ICU with ALİ-ARDS. The therapy of oseltamavir, vancomycin, levofloxasin, puls steroid (1 gr/day) and NIV was started. In a few days the patient's clinic improved. The culture results showed H1N1 infection. Initial therapy of oseltamavir, pulse steroid therapy and NİV support results as suitable therapy for H1N1 induced ALI-ARDS. ECMO support is vital therapy in severe cases.