On the basis of bilinear Z-transfrom and prewarping technology, this paper analyses realizable circuit of high-order switched capacitor low-pass filters with leapfrog structure using state-variable method and signal flow graph ( SFG). The designing procedure and an example are given. 在双线性变换和预畸技术的基础上本文采用状态变量法和信号汛图分析了跳耦型高阶开关电容低通滤波器的实现电路,给出了设计步骤和实例。