This thesis arranges the job content of a Yushi Zhongchen (vice censor-in-chief) and discusses its changing during the reign of Song Renzong. Among the changes of a Yushi Zhongchen’s duty in Renzong dynasty, this thesis proposes its distinguishing feature was by significantly changing towards finance and local supervision, attaching importance to fiscal work. System varies with historical contexts. Therefore, besides the duty of a Yu Shih Chung Cheng and its changing during the reign of Song Renzong, this thesis also investigates the historical contexts of Renzong dynasty including Song -Liao war, Sung-Hsia war, national financial embarrassment and the problem of local chien-ssu (intendant, circuit). Considering these historical contexts, this thesis reexamines the causes of Yushi Zhongchen system’s change during Song Renzong dynasty