Asthma is a chronic disease of airways with an underlying inflammatory component. Rhinosinusitis is a common comorbidity of asthma. The association between them seems to be more than epiphenomenon, but it is still a matter of controversy whether a causal relationship exists, wherein rhinosinusitis worsens asthma, or whether they are manifestations in different parts of the respiratory tract of the same underlying disease process. The aim of this study to determine the prevalence of rhinosinusitis in asthmatic children. Thirty asthmatic children aged 3 to 12 years (6.66±4.45year) were recruited for the precent study. Rhinosinusitis which detected by CT sinus is significantly detected (77% of our patients) in asthmatic children. The total esinophilic count is significantly high in asthmatic patients who had rhinosinusitis detected by CT sinus. Our results also revealed also that there is insignificant correlation of both total esinophilic count and IgE level with CT finding , this is in line with that rhinosinusitis and asthma are an expression of a common inflammatory process not always affected by allergy status in which esinophils and IgE play a central role.