This study was done to evaluate the effect of steroid therapy by its three forms (I.V – oral – inhaler ) on the cellular pattern of BAL COPD patient .30patients were included in this study and were divided into 3groups.*group I : 10 patient received I.V steroids*group II :10 patient received oral steroids*group III :10patient received inhaler steroidsAll patient were subjected to the following .1-Full history and thorough clinical examination 2-Chest X-ray P-A view &lateral view .3-BAL which was studied for cellularity .4-The patient is received steroids for 15 days .5-BAL was redone after steroids therapy and BAL fluid was studied for cellular pattern.6-Comparison was done between cellular pattern before &after steroids .7-It was found that all fors of steroids affect the cellularity but inhaler form has the greatest effect followed by intravenous form followed by oral form .