This study investigated the variation of the threshold strain and pore water pressure response of the coils at high amplitude vibration using resonant column test. As a result of tests, threshold shear strains of soft clay, clean quartz sand and stiff volcanic deposit were turned out to be 1$ imes$10-2%, 1$ imes$10-3%, 1$ imes$10-4% respectively. Also, threshold shear Strain was found to be changed with confining pressure for the clean quartz sand. An increase of pore water pressure with shear strain was not significant within the shear strain 3~4$ imes$10-3%, but it was abruptly increased beyond shear strain 1$ imes$10-2%.