The former Vice-Commander of the CSF and current Chairman of the Board of Taiwan Machinery Manufacturing Corporation, Lei Ying, describes Cheng Wei-yuan as follows: "He is really able to select people, to delegate authority, and to trust people" and is "a really rare individual."
曾任聯勤副總司令，現任台機公司董事長的雷穎，在鄭為元任聯勤總司令時，曾擔任他的參謀長。他形容鄭為元是：「能選人、能授權、信任人」、「難得的人物」。