In 1644 the Manchus established their overlordship of China by setting up the Ch'ing dynasty, which lasted 267 years. Alien rule of an empire over such a long period has been historically exceptional, and Ch'ing bureaucracy has thus been an interesting subject for many scholars. It is the intention of this paper to make an inquiry into the patterns of position mobility of the chief officials in the Grand Secretariat, in Various Boards, and in the Censorate-general between 1730 and 1906. the period under review dates from the time when Emperor Yung-cheng (1723-35) bureaucratic hierarchy and ends with the massive change it government structure made in 1906 under the Emperor Kuang-hsu (1875-1908).