According to McKinsey and company, in its report stated that the great Indian bazaar and the organized retail comes of age in India and noted that these are exciting times for Indian retail. By 2015, India is set to become a $450 billion retail market, comparable in size to Italy ($462 billion) and much larger than Brazil ($258 billion). The report estimates that organized retailing accounts for less than 5% of today's market, but is expected to expand to anywhere between 14% and 18% by 2015. In order to achieve a competitive position in the market all modern retail stores work more and wants to retain their customer by offering more discount, schemes and benefits to their customer and also use modern technology to speed up their services in order to satisfy the reliable customers' in big cities. In this scenario consumer behaviour helps to identify the behaviour of the consumer upon that product and also for the market. The main objective of the study is to find the overall consumer buying behavior and preference. Data from the customers visiting big bazaar were collected as population study. The primary data was obtained through questionnaire and secondary data from the company records and through internet. This research work will propose a true idea that identifies key factors which are of great importance to measure the customers' buying behavior and preference towards organized retailing in big bazar located in Chennai city, Tamil Nadu. From the descriptive analysis it was found that majority of the customers' were satisfied with the services provided to them. © Serials Publications.