Understanding in changes of cropping systems over time and seasons related to the shifting of cropping patterns of a particular area is of importance for guiding policy makers, researchers and extension personnel for future research and development planning. The diagnostic sample survey was conducted in five Blocks under five upazilas of greater Kushtia district during 2004 using pre designed and pretested questionnaire with a view to documenting the changes in cropping patterns and the reasons for the shift therein. About 80 % of the net cropped area were found under rice based cropping patterns Which was increased at about 89 % during 1998-99 to 2002-03. A total of 14 rice based cropping Patterns were identified in greater Kushtia district which was decreased and resulted in decreasing tendency in crop diversity. Lion's share of the cropped area was covered by Born-Fallow Transplanted Aman, which was remarkably increased in all Blocks over time. The pulses and spices are replaced by Bore rice, tobacco, maize, aroid and potato. Increased irrigation facilities, lack of appropriate marketing channel and increased insect and disease pressure in pulses and other minor crops are the main reasons for the shifting of cropping patterns. The farmers demanded improved varieties of Aus and Transplanted ,4man rices like BR11 and Swarna, suitable for this drought prone area. Research and development activities for non-rice crops in this area might get priority for sustainable crop diversity.