Abstract: The emergence of the concept of “clean official” was to sum up the assessment to some ideal bureaucrats opposite to “corrupt official” in the ancient Chinese politics. About one hundred years in the 18th century, that is the so-called “Kang-Qian Grand Era”, the situation changed. Clean officials could hardly make, nor be able to make, however, many of them were not trustworthy in term of virtues. The article is trying to make a profound analysis to the affaire mentioned political phenomenon based on the another consideration of the traditional way of official-appointing by Emperor Yongzheng.