This study as a three blind clinical trial in two groups of intervention and control was completed. 50 children of 7 to 12 years old with the diagnose of mild intermittent asthma by the specialists of Immunology and Allergy were enrolled. The children were randomly assigned to two experimental and control groups. Patients at the beginning of a common cold by expert were examined and history, physical examination and peak flow expiratory using a peak flow meter were recorded, then herbal medicine (combined with honey and extracts of hyssop, mallow, thyme narrow, violets and Khorasani dates, dried figs, licorice, mallow, veneris) was administrated to the intervention group and placebo (a substance like herbs with the same shape,odor, design and color) was administered to the control group. In the intervention group patients according to age received a certain amount of medicinal plants (5 ml every 8 hours).The treatment was continued for 5 days. Again on the third day and the fourteenth day by phone and in seventh day in personal were examined and the information (history, physical examination and peak flow) were noted in the checklist.