Firstly, this paper gives the definition of Performance and Achievements of Administrative Organizations (PAAO) and that of Knowledge Sharing. Secondly, it analyzes the problems accruing from China's traditional model of PAAO. Lastly, with the above analysis, it brings forward the improved Knowledge Sharing-based model of PAAO, analyzes the knowledge characteristics of administrative organizations and the mutual influences, and sets forth the important role that Knowledge Sharing plays in improving the model of PAAO.