Although three times of successive merger for credit department of farms'' associations, there were rebounds and doubts from the farmers resulted in the shortage of correspondent compact programs and less belief on the procedure adopted by the government. Keeping an eye on financial interface to adopt the merger of those objective credit departments is not suitable than focusing on handling the appropriate success key factors seems to be a priority issue for the public. With regard to the merger of credit department of farms? associations in this paper, there are preannouncement phase, transition phase and consolidation phase, three procedures of merger model adopted by theories and consolidated by building up key success factors model individually to take up questionnaire on experts and supervisors proceed by analytic hierarchy process which were considered in row that strengthening constitution to promote competition, dealing with salary, laying off and retirement rights and interests properly, and cultural mix for long term cooperation are the most important key success factors.
