In this paperm, we describe the crossover of the parasitic capacitance at the interconnections for the system munuature, analyse ground capacitance and mutual capacitance due to actually coupled line in the ICs or MCCs. From the results of deviding interconnection line with infinite parts, using Green;s function with image charge method and moments, we could obtain 70% decrease of system suntime without difference of reference. In the designing ot layout of MMIC, PCB, MCM, we can easily use parastic inductance because of simplicity of transforming formular.