由于法律本身的局限性以及行政活动广杂专变的特点,行政自由裁量权有其存在的必然性,也因而促成了行政自由裁量行为的蓬勃发展。然而,自由不等于随意,行政自由裁量行为需要司法对其进行合理性审查.目前,合理性审查在理论上的若干难点已影响到了司法实践对行政自由裁量行为的制约。亟需实现司法对行政自由裁量行为的有效把关。 Due to the limitations of the law itself and the wide range of specialties of administrative activities, administrative discretion has its own inevitability, which has contributed to the vigorous development of administrative discretion. However, freedom is not equal to arbitrariness, and administrative discretion needs judicial review of its rationality.Currently, some theoretical difficulties of reasonableness review have affected the restriction of judicial practice on administrative discretion. There is an urgent need to realize effective judicial control of administrative discretion.