Asthma is a chronic airway inflammation and many triggers can induce asthma exacerbation. The pattern of childhood asthma admitted to National Hospital of Pediatrics due to asthma attacks is different from other medical centers. The study was conducted to indentify the features of children with acute asthma which were treated at the National Hospital of Pediatrics. It was a cross-sectional study, in children under 15 years of age admitted to hospital due to acute asthma. In 146 hospitalised childhood asthma, group between 2- 6 years old was the most common, accounting for more than 50 percent, boy/girl ratio was 1.92/1. Almost children admitted to hospital were at the moderate and severe asthma, in which severe asthma were 28.77 percent. Weather changing and viral respiratory infection has been seen as the main triggers induced asthma exaerbation in children. Rhinovirus from nasopharygeal aspiration were found in 72.6 percent of children with acute asthma, and the rate was highest in children more than 6 years of age, by 80.1 percent. Conclusion: Childhood asthma admitted to hospital due to asthma attack have been seem at all kind of age, but more often in 2-6 years old group. Viral respiratory infection, especially Rhinovirus was the risk factor to induce asthma exacerbation and incresed asthma severity.