Due to the properly policy for encourage economy with taking a favorable turn prosperously, make the people increase the will to buy new cars in the recent years. Besides, the maintenance offered and maintenance service quality of the automobile maintained factory is another factor for consideration to buy new cars of the customer. Therefore, how to increase the satisfaction and the brand loyalty of customers plays an important role for all automobile maintained factories. So this research tries to utilize FMEA method, TOPSIS skill and questionnaire to study the satisfaction level of customers about maintenance service provided by automobile maintained factory in Taiwan area. The results of this research offer the improvement order and exact mode for maintained factory's service process, and to be a reference to relevant enterprises for change their manage mode.