The system of civil servants is related to the legitimacy to of t the performaece of pubic mission,therefore,this article will forcus on the review of the civil servants’ competency when they into the government and after that .Researching on the Article 28 of “Civil Service Employment Act”,we can find four kinds of “unfitness factor”,include of :” factor of loyalty and nationality”, ” factor of legal responsibilityliability” , ” factor of psychosomatic illness”,and other else. Through this discussion of the issues in theories and practice , this article offer several opinions and suggestions, and look forward to the of the improvement of the system of civil servants.