The silicon MOSFET and single-electron-transistor (SET) with a movable gate electrode (MGE) are reported. For the first time, the modulation of the pull-in voltage, where subthreshold swing (SS) is much steeper than 60mV/dec, is experimentally demonstrated in MGE MOSFET using an additional electrode. The modulation of FWHM and peak position of Coulomb blockade oscillation (CBO) by tuning capacitance of SET is also experimentally demonstrated for the first time.