合法性审查原则是行政诉讼的特有原则之一，实践中我们贯彻这一原则的主要方法就是按照法定构成要件审查被诉具体行政行为的合法性，即通常所说的５个方面的审查：主体资格、事实证据、适用法律、执法程序、执法目的。可以说，把握住这５个方面，行政案件的审理就抓住了核心。? The principle of legality examination is one of the unique principles of administrative litigation. In practice, the main method by which we implement this principle is to examine the legality of the specific administrative act in litigation in accordance with the statutory constitutional requirements, namely the commonly referred to as the review of five aspects: Qualifications, factual evidence, applicable law, law enforcement procedures, law enforcement purposes. It can be said that grasp these five aspects, the trial of administrative cases to seize the core. ?