【摘要】既判力理论作为诉讼法学的基本理论范畴，其实质在于维护司法裁判的权威性和国家法治的安定性。就行政诉讼而言，应当真正确立行政判决既判力，树立法院权威性。确立行政诉讼判决的既判力，有必要解决行政诉讼既判力效力范围、制度根据、行政诉讼判决既判力的否定以及与其他相关原理的关系。建立适合我国的行政判决既判力制度，完善我国的行政诉讼制度。

【关键词】既判力　行政诉讼  权威性　范围

【Abstract】Res judicata theory as the basic theory of litigation areas of law, and its essence is to maintain the authority of the administration of justice and national stability of the rule of law. To administrative proceedings, the administrative decision establishing res judicata should really establish a court authority. Administrative proceedings to establish res judicata ruling, the need to address the scope of administrative litigation res judicata effect, the system according to, administrative proceedings and denial of res judicata judgments and other relevant principles of relationship. Establishment of a suitable system of res judicata of administrative decisions, and improve the system of administrative litigation.

【Key words】Res judicata; Administrative Litigation; Authority;Range