Abstract: It is presented a method of the nth order current mode leapfrog-type filter based on CCCII(second generation current controlled conveyor).By defining the transfer function H(s)(Io(j)/Iin) from the filter input to the output of integrator,the corresponding transfer function H(s) of the all-pole filters and filters with arbitrary transmission zeros can be derived.Parameter values of the designed filter can be obtained from the coefficient matching equations based on the comparison between the numerator and denominator polynomials coefficients of H(s) and the given Hd(s).Parameter values of the designed filter can be computed easily.As an example,it is also maked design of parameter values and PSPICEsimulation for the realization of the fourth-order Butterworth low-pass leapfrog-type filter.