The objective of this research is to study the advertising Communication Practices use by top ad agencies in Bangladesh, to find out how the advertising agency works and their role in marketing sector. In order to achieve the above mentioned objective and finish the study, I have made a judicious and a balanced use of primary sources as well as secondary sources of data collection. The primary sources comprise of direct interaction with ex. colleagues of my previous work place and communication with some renown advertising agency personnel. I tried to research with some questionnaire that would serve the purpose in the most efficient and productive way. Due to factors like lack of cooperation anticipated from some agencies, considering of the secrecy of data made me to resort to secondary sources like internet, websites, magazines and newspapers. In this study I have observed many fact of advertising agencies- their strength, weakness, opportunities and threats.There are lack of dynamism in the agencies as far as expansion plans are concerned, diversification objectives are involved or specialization motives.