Crop diversification is considered as a resilience mechanism followed by farmers in different regions. In the present study, it is shown that there exists crop diversification of crops in various districts of Tamil Nadu State, India. This is done by constructing a crop diversification index which provides a basis for ranking the different districts. So in those regions which are more vulnerable for climatic change, more diversification of crops must be diversified in order to avoid risk of crop failure and loss of income and employment to the rural people.