Based on the theory of transmission current-switch, and analyzes current signal operation of add and subtract. By using this method, the current-mode CMOS circuits of modulo-3 adder and 2-bit binary full-adder have been designed in this paper. 以传输电流开关理论为基础,分析了电流信号的相加与相减运算及其电路的实现方法,并利用该设计方法设计了模3加和2位二值全加器的电流型CMOS电路。