With the economic development, social structure changes, financial liberalization and industrial and commercial activities are gradually internationalized. Besides, the problem of operating losses has begun to emerge of the credit departments of farmers’ association. Therefore, evaluating the operation performance of the farmers’ association is the most important issue for strengthening the operation. This study applied grey correlation analysis to evaluate the operating performance of 26 farmers’ associations in Changhua by using seven performance ratios, including deposit loan ratio, loan coverage ratio, total assets turnover, return on equity ratio, return on sale ratio, net worth-to-risk assets (NWRA) ratio, and return on assets ratio. The result shows the total asset turnover rate is an important indicator for the operating performance of the credit departments of farmers’ association, and can be used as a strategic indicator for improving operating performance for association.