对分数阶微分算子 Sr( rIR ) 的离散化是分数阶控制系统数字化实现的关键所在, 不同的离散化方法有其各自的优缺点和适用范围, 通过实例仿真, 对常用的几种离散化方法进行了详细的分析比较, 对 A l- A laoui算子的连分式展开逼近法进行相角补偿-For fractional differential operator Sr (rIR) discretization is the key for fractional digital implementation, different discrete methods has its own advantages and disadvantages and scope of application, through simulation examples, several commonly used discrete a detailed analysis method comparison, a l- a laoui operator continued fraction approximation method phase angle compensation